Real Astral Travel requires a lot of sadhana. Once it comes, we do not have to sit in a specific place or lay down or do anything specific to experience it.
One can astral project even while talking to somebody or even while working on a computer. It becomes as easy as looking at the door of your room.
Some people profess that we can experience things all by ourselves. Sure, we can but it doesn’t mean not having a guide who has himself/herself traveled the path that we wish to walk on.
If it were really in our hands only then we already had led ourselves to an out-of-body experience by now but the fact that, at present, we are not able to have an out-of-body experience, is in itself a proof that we need a guide.
That’s why it is very important that if we desire to have an out-of-body experience, then the first thing is, we must find a Perfect Living Spiritual Teacher.