Preparation

The preparatory practices prepare our mind for successful meditation by purifying hindrances caused by our previous negative actions, empowering our mind with merit, and inspiring it with the blessings of the Buddhas and Bodhisattvas.
Geshe Kelsang explains that we all have the potential to gain realizations of the twenty-one Lamrim meditations. As he says,
These potentials are like seeds in the field of our mind, and our meditation practice is like cultivating these seeds. However, our meditation practice will be successful only if we make good preparations beforehand. If we want to cultivate external crops we begin by making careful preparations. First, we remove from the soil anything that might obstruct their growth, such as stones and weeds. Second, we enrich the soil with compost or fertilizer to give it the strength to sustain growth. Third, we provide warm, moist conditions to enable the seeds to germinate and the plants to grow. In the same way, to cultivate our inner crops of Dharma realizations we must also begin by making careful preparations. First, we must purify our mind to eliminate the negative karma we have accumulated in the past, because if we do not purify this karma it will obstruct the growth of Dharma realizations. Second, we need to give our mind the strength to support the growth of Dharma realizations by accumulating merit. Third, we need to activate and sustain the growth of Dharma realizations by receiving the blessings of the holy beings. It is very important to receive blessings. For example, if we are growing outer crops, even if we remove the weeds and fertilize the soil we shall not be able to grow anything if we do not provide warmth and moisture. These germinate the seeds, sustain the growth of the plants, and finally ripen the crop. In the same way, even if we purify our mind and accumulate merit we shall find it difficult to meet with success in our meditations if we do not receive the blessings of the holy beings. Receiving blessings transforms our mind by activating our virtuous potentials, sustaining the growth of our Dharma realizations, and bringing our Dharma practice to completion.
From this we can see that there are three essential preparations for successful meditation: purifying negativities, accumulating merit, and receiving blessings.
If you like, you can engage in these preparatory practices by reciting the following prayers while contemplating their meaning,
Going for refuge
(We imagine ourself and all other living beings going for refuge
while reciting three times):

I and all sentient beings, until we achieve enlightenment,
Go for refuge to Buddha, Dharma, and Sangha. (3x, 7x, 100x, or more)
Generating bodhichitta
Through the virtues I collect by giving and other perfections,
May I become a Buddha for the benefit of all. (3x)
Generating the four immeasurables
May everyone be happy,
May everyone be free from misery,
May no one ever be separated from their happiness,
May everyone have equanimity, free from hatred and attachment.
Visualizing the Field for Accumulating Merit
In the space before me is the living Buddha Shakyamuni surrounded
by all the Buddhas and Bodhisattvas, like the full moon surrounded by stars.
Prayer of seven limbs
With my body, speech, and mind, humbly I prostrate,
And make offerings both set out and imagined.
I confess my wrong deeds from all time,
And rejoice in the virtues of all.
Please stay until samsara ceases,
And turn the Wheel of Dharma for us.
I dedicate all virtues to great enlightenment.
Offering the mandala
The ground sprinkled with perfume and spread with flowers,
The Great Mountain, four lands, sun and moon,
Seen as a Buddha Land and offered thus,
May all beings enjoy such Pure Lands.
I offer without any sense of loss

Meditation

When through our contemplations the object appears clearly, we leave our analytical meditation and concentrate on the object single-pointedly. This single-pointed concentration is the third part, the actual meditation.
When we first start to meditate, our concentration is poor; we are easily distracted and often lose our object of meditation. Therefore, to begin with we shall probably need to alternate between contemplation and placement meditation many times in each session. For example, if we are meditating on compassion we begin by contemplating the various sufferings experienced by living beings until a strong feeling of compassion arises in our heart. When this feeling arises we meditate on it single-pointedly. If the feeling fades, or if our mind wanders to another object, we should return to analytical meditation to bring the feeling back to mind. When the feeling has been restored we once again leave our analytical meditation and hold the feeling with single-pointed concentration.
Both contemplation and meditation serve to acquaint our mind with virtuous objects. The more familiar we are with such objects, the more peaceful our mind becomes. By training in meditation, and living in accordance with the insights and resolutions developed during meditation, eventually we shall be able to maintain a peaceful mind continuously, throughout our life.

Contemplation

The purpose of contemplation is to bring to mind the object of placement meditation. We do this by considering various lines of reasoning, contemplating analogies, and reflecting on the scriptures. It is helpful to memorize the contemplations given in each section so that we can meditate without having to look at the text. The contemplations given here are intended only as guidelines. We should supplement and enrich them with whatever reasons and examples we find helpful.

Subsequent Practice

This consists of advice on how to integrate the meditation into our daily life. It is important to remember that Dharma practice is not confined to our activities during the meditation session; it should permeate our whole life. We should not allow a gulf to develop between our meditation and our daily life, because the success of our meditation depends upon the purity of our conduct outside the meditation session. We should keep a watch over our mind at all times by applying mindfulness, alertness, and conscientiousness; and we should try to abandon whatever bad habits we may have. Deep experience of Dharma is the result of practical training over a long period of time, both in and out of meditation, therefore we should practise steadily and gently, without being in a hurry to see results. To summarize, our mind is like a field. Engaging in the preparatory practices is like preparing the field by removing obstacles caused by past negative actions, making it fertile with merit, and watering it with the blessings of the holy beings. Contemplation and meditation are like sowing good seeds, and dedication and subsequent practice are the methods for ripening our harvest of Dharma realizations.
Lamrim instructions are not given merely for the sake of intellectual understanding of the path to enlightenment. They are given to help us to gain deep experience, and should therefore be put into practice. If we train our mind in these meditations every day, eventually we shall gain perfect realizations of all the stages of the path. Until we have reached this stage we should not tire of listening to oral teachings on Lamrim or reading authentic Lamrim commentaries, and then contemplating and meditating on these instructions. We need continually to expand our understanding of these essential topics and to use this new understanding to enhance our regular meditation.

Dedication

Dedication directs the merit produced by our meditation towards the attainment of Buddhahood. If merit is not dedicated it can easily be destroyed by anger. By reciting the dedication prayers sincerely at the end of each meditation session we ensure that the merit we created by meditating is not wasted but acts as a cause for enlightenment

Meditation Posture

When we practise meditation we need to have a comfortable seat and a good posture. The most important feature of the posture is to keep our back straight. To help us do this, if we are sitting on a cushion we make sure that the back of the cushion is slightly higher than the front, inclining our pelvis slightly forward. It is not necessary at first to sit cross-legged, but it is a good idea to become accustomed to sitting in the posture of Buddha Vairochana. If we cannot hold this posture we should sit in one which is as close to this as possible while remaining comfortable.
The seven features of Vairochana's posture are:
(1) The legs are crossed in the vajra posture. This helps to reduce thoughts and feelings of desirous attachment.
(2) The right hand is placed in the left hand, palms upwards, with the tips of the thumbs slightly raised and gently touching. The hands are held about four fingers' width below the navel. This helps us to develop good concentration. The right hand symbolizes method and the left hand symbolizes wisdom - the two together symbolize the union of method and wisdom. The two thumbs at the level of the navel symbolize the blazing of inner fire.
(3) The back is straight but not tense. This helps us to develop and maintain a clear mind, and it allows the subtle energy winds to flow freely.
(4) The lips and teeth are held as usual, but the tongue touches against the back of the upper teeth. This prevents excessive salivation while also preventing our mouth from becoming too dry.
(5) The head is tipped a little forward with the chin slightly tucked in so that the eyes are cast down. This helps prevent mental excitement.
(6) The eyes are neither wide open nor completely closed, but remain half open and gaze down along the line of the nose. If the eyes are wide open we are likely to develop mental excitement and if they are closed we are likely to develop mental sinking.
(7) The shoulders are level and the elbows are held slightly away from the sides to let air circulate.
A further feature of Vairochana's posture is the preliminary breathing meditation, which prepares our mind for developing a good motivation. When we sit down to meditate our mind is usually full of disturbing thoughts, and we cannot immediately convert such a state of mind into the virtuous one we need as our motivation. A negative, disturbed state of mind is like pitch-black cloth. We cannot dye pitch-black cloth any other colour unless we first remove all the black dye and make the cloth white again. In the same way, if we want to colour our mind with a virtuous motivation we need to clear away all our negative thoughts and distractions. We can accomplish this temporarily by practising breathing meditation.
When we have settled down comfortably on our meditation seat we begin by becoming aware of the thoughts and distractions that are arising in our mind. Then we gently turn our attention to our breath, letting its rhythm remain normal. As we breathe out we imagine that we are breathing away all disturbing thoughts and distractions in the form of black smoke that vanishes in space. As we breathe in we imagine that we are breathing in all the blessings and inspiration of the holy beings in the form of white light that enters our body and absorbs into our heart. We maintain this visualization single-pointedly with each inhalation and exhalation for twenty-one rounds, or until our mind has become peaceful and alert. If we concentrate on our breathing in this way, negative thoughts and distractions will temporarily disappear because we cannot concentrate on more than one object at a time. At the conclusion of our breathing meditation we should think `Now I have received the blessings and inspiration of all the holy beings.' At this stage our mind is like a clean white cloth which we can now colour with a virtuous motivation such as compassion or bodhichitta.