How to get possessed by a Spirit in rituals?

how do you, magicians who work with possession, do to get possessed? I have an altar for Beelzebub, with bull skull, bones and other elements, and daily I light a candle, put alcohol in a goat horn that I use as a chalice and meditate before the altar and mantle the name Beelzebub

. I would like tips on wizards who work with possession in their rituals on how to achieve a state of possession in rituals

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Behemoth-X has a good video on what it’s like for him.

I’ve had it happen willingly outside of ritual, but not in.