Were you guys ever nervous at any point during flight school in regards to actually flying the airplane?
If you're NOT stressed about some aspect of flying/briefing etc. (And you aren't a super high time pilot already) you're the 1 in a million.
At every stage I have stressed to some degree about the training (OCS, IFS, API Primary) but after doing the event (flying, tests, inspections) I realized that preperation, taking instruction gracefully and fixing defincies was the "secret" to success. Before you know it, a flight is just another day (that's nauseatingly awesome) and like a good workout it beats your ass but when you see the improvement in your skills there's no better high.
I used to think when people said about the military "I accomplished things I never thought I could" was a bunch of BS from low aspiring scaredy cats. I've realized that I was completely wrong (and a bit of a jerk) and that if you're willing to face your fears and apprehension you will find yourself doing things naturally and expertly that used to seem insurmountable.
When I get anxious about things now, I think in two months (or even weeks) this won't even be on the radar and I'll do it like second nature. So why worry?