Thereupon, the yogi may proceed to practice the formal or real Transformation Yoga as follows: Sitting in a crouching posture, grasp the two knees with hands clasped, recite the prayer of Taking Refuge and the prayer of Raising the Bodhi Heart. Then visualize your body become the body of one's patron Buddha; also think that the patron Buddha whose essence is identical with that of your

guru, sits in the sky in front of and above your head at a distance of one to six feet. With great earnestness and faith the yogi should pray to him. Then, with a clear visualization of the Ah word at the Navel Center, the Hum word at the Heart Center, and the Kha word at the Pure-Gate Center, the yogi pulls the lower prana to drive up the Ah word into the Hum word through the Central Channel, and thus the two words are fused in one. Meantime, he should pull up all his strength and say loudly "Ah-hi-ga" many times, until he feels that the Ah word has been actually driven into the Hum word. Then he says again "Ah-hi-ga" loudly twenty times, and the Hum word thus rises to the Throat Center. At this time the yogi should visualize clearly the Kha word standing at the Gate of Purity; the gate is open and through it can be seen clearly the firmament as one sees the bright sky through an open window. Then the yogi pulls all his strength together and shouts "Ah-hi-ga" five times; through this force the Hum word is ejected (with great speed) from the Gate of Purity and hits right into the Heart Center of the patron Buddha [above your head]. Thereupon, the yogi concentrates his mind in the realm of Non-Thought.

Based on the Tantra of Gdan-bzhi as well as the verbal instructions given by gurus is this brief instruction on the Transformation Yoga.

Furthermore, according to the teaching of Tantras and their commentaries, the yogi will gain great profit if he understands the way of meditating on the crown of two sounded letters, of visualizing the two words with the heads of the letters seeing upward and downward; the way of "calling-with-prana" during the up-going and down-coming performance; and other special superb instructions.