Well, SP means paralysis from name . You cannot move then.
I never had a OoBE, so i cannot say a thing about it . And most times there is no problems to wake up in LD (you need to do RC after waking up, FA thing)
In most yes. But you can also transform yourself, or in wicked dreams, not have body at all . Movie-like dreams, for example.
It depends. It might be easy for you, but very hard to do for someone other. THIS might be useful .