Yes!
It's fascinating stuff and I spent years wondering why I wasn't getting anywhere. I first read about it on Demon's Domain when I was about 13 (old Fidonet hang-out related to all things occult).
Anyway, I spent a good deal of my early adolescence laying flat-out on the floor of our spare room getting tingly fingers, playing with my heartbeat, feeling very cold and wondering why I wasn't out of my body yet lol
When I was quite a bit older and started reading up on entheogens and trance induced projections I realised that's what all the accounts from early shamanism were on about - had a bit more help than the average spotty teenager from Northamptonshire

But what broke the ice for me was getting into dreaming in a big way. I'd heard accounts of people rolling out of their bodies. I'd managed to do the hand-apparition thing where you get this sensation that your hand has lifted up from your physical hand and can move about. I also spent long car journeys letting my 'soul-self' fly along outside the car - I guess, looking at it now, it's a type of meditation.
But I never got proper out of my body. Until, like I say, I got into dreaming and most accounts you'll hear of full-on astral projection/OBE will be from people drifting off or on the borderlands of sleep.
Again, to really 'out' yourself from your physical body needs a little help, which you can get from chewing mushrooms, or from playing with the borderline of wake/sleep.
Dreaming is the key to really prolific OBE experiences. Immerse yourself in OBEs - imagine what they're like, read all you can find on them, talk about them, type about them, make up stories about them and you will induce them. You're mind will fill up with what you want to achieve and it will happen. Often unexpectedly and sometimes after you've lost your interest in them because you think they're never going to happen. Like most truly amazing experiences, you don't control them or tell them what to do, they come find you and take you with them.
They come in strange shapes and sizes. OBEs (Out of Body Experiences) you don't always know you've had one 'til it's over. You think you're awake, you might just go about doing really mundane stuff. Then you will actually wake up and realise you weren't awake before.
Other times you'll enter one from dreamstate - I had a dream once where I was bouncing up and down on a bed in an underground bunker trying desperately to touch an overhead electric light bulb. I knew that if I could just touch it I'd leave my body. I jumped and jumped and eventually with enormous effort, I touched it! The rush as I left my body was so exhilarating it woke me up! Pants

Other times, and the type of controlled astral projection you're probably talking about, you reach through lucid dreaming. You're dreaming, you become aware you're dreaming, you take it from there. More control than waking up after the event and realising it's over. But again, projection tends to have a finite length of time to it. If you don't wake yourself with the realisation you're actually travelling you tend to slip back into ordinary dreamstate after a while - sometimes you can do it a few times in one night. Possibly to do with chemical cycles of sleep. Though I probably shouldn't have told you this because now it'll be printed somewhere in your psyche and you'll believe it

Anyway. focus on dreaming. One way to slip into lucid dramstate is to lie there as you're drifting off to sleep - don't over think it or try and direct your thinking, sit like you would as an audience member at the cinema, just let all images come at you - and you'll see some weird stuff you can't figure out where it came from. But just let it wash over. You'll get more and more tired but you'll find as well as this tiredness there's part of yourself still there watching that isn't tired at all. This part of you can step out into the images and the dreams. Mostly you'll just fall asleep and wake up the next morning as normal, but sometimes you'll find that after the 'death' of conscious thought, this second self will be reborn into dreams - you will transfer to it. Your natural instinct is to try and make this happen - the more you try and make it the tireder you'll get quicker. You can't force it. But just be aware of it. You have to let go and sleep, like hypnotism it doesn't work if you try and stay awake to know what it feels like

But build up a dialogue with that second self, it's the part that travels

Drown in dreaming, make it your focal point and travel will follow.
Let us know how you go! x