Doubt

With 13 more days until the start of the Iditarod Invitational I feel like I'm pretty much as ready as I'm going to get. I just got my new Mountain Hardwear Ghost -40 sleeping bag in the mail today. I've got a few other last minute minor gear upgrades I'm planning to make and I'll certainly put in several more good days of training between now and March 1st, but the race could start tomorrow afternoon and I'd more or less be ready to go. I still have lots of doubts about various things. I have no idea what caused my ankle and back of knee pain that forced me to drop out of the race last year so I have no way of knowing for sure that the same thing won't happen again. I've never been out for any extended period of time in weather colder than 20 below zero so I really don't know for certain that the gear I have chosen will get the job done if the temperatures dip to 30 or 40 below. I feel confident in my physical strength and in my gear, but until I get out there and push beyond my current limits I have at least some level of doubt. These doubts if kept at their current level are, I think, a good thing. The key though is to try to find a way to not let these doubts create too much anxiety between now and the start of the race.