I'm writing a book about ganzfeld psi work

I did. I'm pretty sure it wasn't a hit and I can't say I enjoyed the ganzfeld experience itself. It was too odd for me to get comfortable plus, whenever images would start to form I would blink and they'd vanish. A bit frustrating. Still, I'm glad I did it.

That reminds me of some time ago, I took some past-life regression video on youtube and attempted to go along with the self-hypnosis. It must have taken me three or four attempts over a number of months before I became comfortable with the methodology - and my physical environment, to be able to just go along with things without breaking the flow and arriving abruptly back in everyday awareness.

Maybe, without even considering the psi aspects, some people are more able to adapt to the conditions comfortably which would be a first step before even beginning the experiment.