You know what, if they judged everyone by who "looks" like they are going to be running, 3/4 of the population would be under scrutiny! Just remember one of the recurring phrases on this board - no matter your pace, you are still passing all of the people sitting on the couch!!! The one thing I learned from training last year is that this is totally do-able - you might be slow as Christmas, but you can absolutely do it. And this half is so much fun, with all the photo ops, that not many people are in it for speed, I think! I'm planning to do another half in March to get my "real" time. The Princess is all about fun! Congrats on the start of training; this is about the time I started training last year from complete couch potato mode and I found it was plenty of time.
In regards to a previous question about running in the winter weather - if you have access to a treadmill, I would def. hit that rather than risk an ice injury so close to the half. Otherwise, if it's just cold, it actually feels kinda good! Here in GA we don't get much snow & ice (except that one week in Jan where the heavens seem to unload and Atlanta is at a standstill!!

) but if you have the right clothes on, you should be fine. I got a great running jacket from Nike.com (with MyCoke Rewards points - boo ya!) that is made for 40 degrees and below. It was great, and I often found myself rolling up the sleeves and unzipping, even in freezing temps b/c on 10 mile long runs, you get a little worked up!! You def. don't want to bundle up too much and then be running with all kinds of extra clothes tucked into your waist band and tied around you!