Astral projection help from those who do it?

ok, so when i get relaxed, i noticed only my hands and arms up to my elbow and sometimes my feet are the only things at become asleep and numb, and i feel the tingling in them before they go numb, but that's it, but i know my body has to all go to sleep while my mind stays awake, and sometimes my feet or shoulders twitch by themselves, is that ok? and when i get there, how do i know how to get out, and how do i know i am out? can you see? should i have my eyes open or closed the entire time? i know somebody who expert at this and i know i have to make sure i look at myself before i go anywhere and i should say a prayer and ask my protectors to watch over me ( this person is like a father to me and can see the dead and has been doing this since his grandma taught him a long time ago.) but he is always out driving the trains now so i can't really talk to him, so i need your help!