Yo have you read Blackmore's stuff on OBE's?

Also I recommend the Lucidology project, the presentation can be a bit... "home shopping network" but there's a lot of good shit about the body's physiological behavior during events like this and it really helped me grasp the actual processes going on in the brain when you're messing around with Hypnagogic states, remaining conscious during sleep paralysis (can be really fucking scary btw) and whatnot.

It's primarily aimed at lucid dreaming but there are applications for astral projection that work really well and the dude behind the project understands these two phenomena are deeply linked.

If you find the traditional meditative/mysticalish methods too much of a grind (and let's be honest, they can be really fucking boring and often results are painfully slow).

If you're just lying there, trying to basically will yourself out of your body using old skool methods (visualize, visualize, visualize amirite?) it's going to be a long haul before your body and brain figure out what it is you're actually asking them to do.

Anyway here's the link, I personally have had relatively impressive results when I factored this information into my efforts and witnessed the biological and neurological reactions and behaviors described in myself, good luck.

[link to www.lucidology.com]