Good for you Karebear1.
The start is pretty crowded, but since this is your first try ever, that's not a bad thing. The danger is being so excited at the start that you zoom out well ahead of your target pace, and blow up somewhere between miles 10 through 13. The large crowd will force you to start slowly, probably slower than you'd like, so you save your legs for the end when you'll really need them.
I have my finishers medal hanging my my office, with my numbered bib. This last January 11 wasn't my first 1/2 marathon, but it was my first WDW marathon, and I had a blast. My wife was so excited about my finish and time that she began to talk about doing it herself this coming year. I took away her option by signing her up for the 1/2 M for her birthday in February, so we'll start together and be together at the finish.
Wearing the finisher medal around WDW on Sunday and Monday is very cool as well, and you'll nod in appreciation to all of those who are wearing one as well. A very well earned bling bling.
Good luck with your training. The course is great, and very flat (only 2 hills, the overpass around mile 5 as you cloverleaf around from EPCOT to the main road into the MK, and the underpass by the Contemporary, when you run under the lake passage. Coming into the MK and turning up Main Street is something you'll always remember.
Congratulations on commiting yourself. It's worth it. I'll see you on January 9. You'll recognize me, I'll be wearing running shoes and gear (well maybe you won't).