Good Luck. I goto meps as well tomorrow to swear in. I agree with above be courteous and polite. Also talk to the processors around you, make friends, or else the day will be seem even longer and you will be eating lunch alone.
Oh yeah DO NOT goto the bathroom 10 mins. before you do the urinalysis, it doesn't work out too well! lol
One of the physicians tried to scare all of us recruits by telling us that if we cant **** during the urinalysis then he will poor steaming hot water on our genitals and it will make us **** and **** everything out of us! lol