Chhinnamasta mantra
This sadhana can be started Thursday after 10 pm. Sit facing the north on a red mat. Cover a wooden seat with a red cloth and on it in a plate place a chhinnamasta yantra. Then light a lamp. Then chant one round of Guru Mantra. Next with a rosary chant 21 round of the Mantra.
Om shreem hreem aim vajra vairochaniye aim hreem shreem om phat swaha
Do this for 51 days. After 51 days ,& place the yantra in your worship place. Briefly worship it daily by lighting and chanting the Mantra 108 times