It is useless for a newcomer to learn the direct way out of the body (in full consciousness) It can only be masters who have achieved perfection in this practice.
BUT, you can quite successfully exit and often the first 5 seconds after awakening from sleep, when the subtle body is not yet fully connected with the physical body, especially if you have such a phenomenon as a sleepy paralysis .. In this state, you can simply roll out or just "get up" from the physical body. When you are so out right away, you need to do the technique of keeping this state. For example, rub palms against each other, try to touch everything with your hands, this will lead to a deepening of the state of the astral .. Otherwise, only thinking about the physical body will suck you into it instantly.
Very well taught to master this way out Michael Raduga.
Download his book in English here and read, practice:
If you open the version in English in Google. With the download of his book in English. He lives in Los Angeles for the last eight years and teaches his method. He organizes seminars.
You can buy from them several discs with the recording of the seminar: "How to get out of the body in three days"