Yea, dont worry about the airlines. Those guys well give you plenty of warning if there anywhere near. If you just make the right radio calls you shouldnt have a problem. (unless of course you run into a cocky 100hr pilot hell bent on showing you just how bad he realy is(e.g ME))
Nah, the big boys have always been good to us littlens, as long as you say where you are they well often help you out.
DONT BE AFRAID TO ASK!!!!
Good luck on the exam, its not as hard as you think.