Dear all, let me outline the vidhi for the siddhi.
The moola mantra has to be recited for 1 lakh times. then with 10,000 number uchhamalari flower , perform a homa. the siddhi will be bestowed.
Now for aghora and tantra, there is a huge deviation in the culmination to complete perfection (siddhi). Let me outline the final steps as per tantra.
After finishing the homa of 10,000, the person should go to the shade of a baniyan tree in the night. This should be tree in the remote location devoid of human presence. Sitting there, he should recite the moola mantra for 1000 times each, 6 days. On the seventh day, the place is sanctified with sandal water in plenty followed by lighting a ghee lamp and chant the mantra without fear till midnight. Then by midnight, you will hear music, sounds of bells etc. the Yakshini will approach you in whichever form you desire and will ask for ritual sex. This ritual gets completed with the culmination of siddhi.
But in aghora, the treatment is different. Before the final ritual, Kubera is invoked as he is the king of the Yakshas and Yakshis. Then the process is repeated like before till the last moment; as same as tantric rules. But in the last moment, when she approaches, the aghori requests her to be the 'ma' for him. So the Yakshini will take that form as he wishes. :)
