Don't be like me. Relax so that your blood pressure isn't elevated. I have to do a 5-day blood pressure check in order to get my FC1 sent off, because I was nervous. My blood pressure was 150's / 80's on my FC1, and on the 5 day check my pressure has been 120 / 70's. High blood pressure is considered 140/90.
Most of the folks at the clinic were cool. Nobody is out to fail you, necessarily.
Oh yeah, stay hydrated, don't listen to loud music, etc....