Well, I empathize. While I will not be doing a mountain bike race, I am doing my first century at the end of October. I am worried about the cutoff and being swept up by the sag wagon. At first I was worried I couldn't go the distance. Now that I feel I probably can, I am worried about doing it fast enough, because I am rather slow. I guess there is always something to worry about. Here is the self talk I am using to try to get my head around it:
"It is what it is. I can only ride my ride and the do best I can do on the day of the ride. If I don't make it, I don't make it. It will be disappointing for sure, but it won't be the end of the world. I will simply keep working and I will make it the next time."
DH and I have bike computers where we can program in a "rabbit." I think we are going to do this for the ride to help keep us on pace. The rabbit will do the course in a pace that will finish the course on time and we have to keep up with it.
Good luck!! and most of all HAVE FUN!!!!
Trek Madone - 5.5 -Brooks B-17
Trek 2.1 WSD - Brooks - B-17 - Trainer bike;
Gary Fisher - Tassajara (MTB) - Specialized Ariel