There's a decent
subreddit with a lot of information and
instructions.
People who claim to be able to do it will tell you that it won't work if you don't believe it will, so it's a tough topic to approach with uncertainty. The steps to do it 'correctly' are a pain in the ass and are another barrier for anyone trying it out casually. People say it takes a lot of practice and that it's like using a muscle you've never used before.
It's apparently a common claim among AP'ers that we don't need to worry because our souls are powerful enough to protect ourselves and our bodies while projecting. AP'ers seem to believe that humans by default have a type of soul that is more powerful than other creatures' and is resistant to possession/etc. as long as we don't give into fear. I can't find it now, but I remember having seen a post along the lines of "remember, you are an immortal being having a temporary human existence."
About a year ago, I had read through enough info that I wanted to give it a shot. I tried a few times to go through the steps, and each time I would just have a vivid dream of an alternate version of the area around my house. I now dream about that 'alternate world' on some nights, but that was the only lasting effect the attempts had. All-in-all it was weird enough that I won't rule out AP being possible, especially since I didn't put a huge amount of time in, but it was far from a wild supernatural adventure. I just try to keep an open mind about this kind of thing because I expect that a lot of it could be explainable once we've made more progress in quantum physics.
I think the existence of stuff like
this is why there're a lot of conspiracies surrounding it. The hobbyist side seems to stay fairly separate from the conspiracy stuff, though, if the AP subreddit's approach is any indication.