My most dear, most kind, most precious, wish-fulfilling one,
I received your question and first you need to do White Tara retreat, 300,000 mantras, then after that you can do Vajrasattva group retreat. When you are doing the White Tara retreat you have to eat white food each day.
If you have received a great Chenrezig initiation, or a great initiation of lower tantra, you can visualize yourself as White Tara. If you haven’t received that initiation, you can visualize White Tara on your crown or in front of you.
Visualize nectar, with the loving kindness and compassion of Tara, is received by you and purifies you, like the sun shining. It purifies instantly all the sickness, spirit harm, negative karma and defilements collected from beginningless rebirths. Think you are totally purified. For half a mala you are being purified and for the other half a mala you are receiving realizations.
Then the same thing happens for all sentient beings, not only in the six realms, but all sentient beings. Think they are purified of their defilements and negative karma and receive realizations. They all become White Tara and receive all the qualities of White Tara.
In your heart visualize a lotus and moon disc, and in the center, high up, visualize all the gurus, His Holiness the Dalai Lama and all the great holy beings who benefit sentient beings. Think their life obstacles are pacified and they receive long life, immortal life. Nectar totally fills their holy bodies.
Next visualize all the Sangha, particularly those who spread the Dharma, who protect the Dharma. Think they all receive immortal life, long life.
Then all the people who do good things for others. Think their obscurations and negative karma, all those things, disease and spirit harm, are purified, and they achieve all the realizations and immortal life. Also your family.
Even the people who are involved in fishing and so forth, killing animals, creating heavy negative karma—think they are purified by the beams, like sunlight. They are totally purified and they all receive immortal nectar and long life.
Similarly, do this for all sentient beings, but mostly do it for yourself. Meditate like this in each session.
With much love and prayers