I've been delaying any kind of posts on this subject until I actually ran it so that I didn't end up wimping out and not doing it.
I left for Birmingham, AL Saturday and crashed at a fraternity brother's apartment that evening. Woke up at 4:30 in the morning, ate breakfast, packed up and headed into the city proper to stretch and attempt to warm up in sub 30°F weather. I lined up with my pace group (which I, very satisfactorily, left behind me as the race progressed), and we all got started at 7:03 that morning.
By mile 3 I didn't even know it was cold. It was tough, but thoroughly invigorating. Mile 13 was the toughest thing I've ever done physically in my entire life. I'm extremely happy to have done it and I'm looking forward to races in the future.
I still don't know how I let my fraternity brother convince me to train and run this race, but I'm very glad I did. I'm a big guy. I'm in pretty good shape, but a big guy none the less, and to have completed that race at my size makes me very hopeful for future success as the weight continues to drop.