Of course I've never attempted so I can't really say, I have done a lot of yoga and I understand meditation, disconnect from your thoughts, etc.

...and astral projection has always seemed like B.S. to me. How I spot bullshit:

1. It's never been historically/scientifically documented from an objective source. (If it has no possibility of every being documented objectively no matter what, it seems even less plausible)

2. It's a concept that humans wish they could have. (Super powers, eternal life, etc.)

I guess anythings possible...but if the brain does somehow develop super x-men powers when more if it is used, I hope we get telekinesis!!!