Of course you're anxious! You'd be nutty if you weren't! Anxiety got me out the door to train when I didn't want to. Anxiety got me to do those long training runs when I did not believe I could run that far. Do try to enjoy it, too, and train smart--carry your Gu and water, or whatever you use.

Running a marathon, doing a triathlon, these things are amazing to me. I've done 4 sprints, 4 olys, a 1/2 marathon and the Chicago Marathon. Who, me? Be proud of yourself! Once I signed up, I magically became a "marathon runner" in my own mind.