All these processes and procedures are explained and described in 'The Tibetan Book of the Dead', or (sub-title) 'The After-Death Experiences on the Bardo Plane'.
My copy is very well-thumbed 1978 copy by Dr. W.Y.Evans-Wentz, from Oxford University Press.
It tells you everything you need to know seen from Evans sitting for years at the feet of a Tibetan läma.
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