Lucid Dream is a good dose but if you're going out of your body you'll do it in your dream and not when you're awake. If you listen this dose you don't have to go to sleep directly after. And there are loads of other ways you can achieve lucid dreams.
Astral Projection felt to me as a sort of Out of Body 0.5. I was going slightly out of my body, but I could still feel it.
Out of Body is definitely the best of the 3. You leave your body, you can't feel it and you can see it from above.
If you want to try OOB (or AP or LD) then you must lay down on your bed, lights out and (what I did) cover your eyes so that you can't be distracted from certain things in your room.
And if you leave your body it could be 5 minutes before the dose end, maybe 5 minutes after.