It, is very complicated to describe it. By this time I cant do it for the most I try to do it. I have a friend that can do it naturally and she ever watch any video, read a book, or doing the exercises to get the astral projection. By the way, she can only travel around her house. LOL
I am actually trying to experience an astral trip, but I have a hard time concentrating deeply. Or I just fall asleep.
There exist many levels of astral trips, there are people that can travel around the world without braking the silver string. (the connection between your astral body and your physical body)
And don't ask me what happen if that string breaks, because I don't know exactly, at least I know that is not good at all... I heard some stupid things like you will die, or you will get crazy because you will stay in the trip forever.
Other thing I heard the key to get its when you are in the most relaxing point you can be before you fall asleep.
I dont know If you have experienced this, but...
sometimes when you are going to sleep you have a feeling that you will fall, or you are falling? (I feel that avery time I go to sleep)
That's because your soul was getting apart from your physical body (the 1st step for the astral projection), but something prevent it to happen.