I tried doing this many years ago, what I did was went to bed hungry, meditation exercise, and trying to will my self out of body, well what happened is my rooom-mate was making brownies, while sleepwalking I went into the kitchen grabbed the pan out of the oven and ate all the brownies and went back to bed.. not a very good experience.
Another successful attempt was while at the dentist office it was the sterotypical out of body experience, very cool experience.