I used to read up on this kind of stuff (along with "How to communicate with the dead/angels/demons". Sadly, my religion doesn't allow me to dabble in that kind of thing. Good luck though.
I used to read all this kind of stuff.[1]
Heck, I found it interesting to
try, but I got nothing out of it. Along with the various similarly 'speculative' books (see footnote about the 100s range reading), I found it interesting, but could never take it seriously. I'd no religious bar to the idea, although maybe I just wasn't credulous in the right way. I quite liked the book that postulated that the biblical "manna from heaven" was actually algae(?)-based nutrition tapped from a nuclear-powered device that provided the heat required[4], and the ones that told me how to astrally project were as much fun to read as the ones that told me about "aliens amongst us". But "nowt came of owt", as some of my contemporaries might have said, albeit from a less bookish stand-point.
Really, the only Astral Projection that I've found to work is the kind that happens at any Planetarium.
[1] Thank (or blame) the fact that these kinds of books were in the 100s section under the
DDS, just after the stuff about computers[2] and that I was sometimes rather methodical in my intensely prolific library usage. (History and Geography (in the 900s) were read up on as well, because of actual attraction to the subject... the 800s of Literature (being discussed in a non-fictional context) was probably not appreciated, because I was
separately eating through the fiction library, and especially the SF/Fantasy shelves[3], so I probably never got a good grounding in criticism/analysis/review of literature, save for what I gleaned from my own opinions.)
[2] "0xx.x..." range, which was pathetically small, thirty or forty years ago in a library that serviced a town, rather than any educational or technical establishment.
[3] Abbott, Adams, Aldiss, Anthony, Anderson, Asimov, Ballard, Banks, Baum, Bova, Bear, Clarke, Dick, Farmer, Foster... Those are the names I can think of, though I'm not so sure whether all of those were from this same era. And I still got to read Pohl and Pratchett, Wells and Wyndham... And yet I recall not completing my alphabetical foray, so I must have deviated from the plan, occasionally.
[4] "Fire by night, smoke by day", and the horrible burns ascribed to the Arc Of The Covenant being caused by radiation upon anyone who (not being a priest,
trained/equipped to approach the equipment, or packing/un-packing it with all the hauling around that was needed) was 'unworthy' of being in its presence...