Nah don't worry about it paddy.
Your instructor will check you out and tell you about UNICOM airfields, how to join un controlled circuits etc.
Apart from that have a read about high altitude, high density altitude operations in low powered aircraft. Apart from that it pretty easy flying n the US from my experence. If most of the inbreed **** wits can survive in the air over there you shouldn't have a problem. To be honest your accent and lack of pubic hair will get you off with most things, none terror related that is.
MJ