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All your questions are answered in the actual Letter of Intent thread.
1: No
2: Yes.
3: No, it can be written before commencing the ritual.
4: No, but 3 am is when the psychic interference is lowest.
5: Yes,
6: You wait for the attentions of the succubus. Keep the candle burning, and yes, you can be clothed.
7: Let the contact go as long as you want, and tell it to stop if you want it to.