Thanks for pointing out my flaws in my advice. I'm trying my best to convey my 1st time experience and I don't think I'm very successful at presenting it very well at all.
My Runkeeper app kept me aware that I was seriously behind my planned pace and I WAS afraid I was going to get swept. I was getting a bit angry at the little lady in my ear telling me that I was behind 2+ minutes off of my desired pace... LOL. (oh, and for safety's sake, my iPod is set to MONO and I only ever wear 1 earbud so I can still hear well on what's going on around me).
I was pretty freaked out when I went over the overpass and saw how close to the end of the pack I was. I could see Epcot right in front of me, so it eased my panic a little bit and as stated, focus on going forward.
The biggest help tip that I had that helped me at the end was that if you keep your arms moving, your legs will follow. Those last 3 miles I was concentrating very heavily on keeping them moving.
As a first timer this year, I wanted to post the times that I did and what I had planned for. What I failed to mention is what I FAILED to plan for. Hills.
Most of my training through the fall and right up to January was on a treadmill (-o-doom_). I kept it mostly at a 2 incline, which is supposed to emulate running on a road (that's what I was told...) I never even thought about overpasses. That overpass at the 10.5-ish mile area is a killer for anyone that didn't take that into account in their training like me.
I thought "Florida is FLAT"... well... for the most part it is fairly flat. Man made hills is what you'll be running on and over though

I currently live near an interstate and there are a couple of overpasses that I now use to help train for hills. I'll NOT be caught by that hill again this upcoming January.
I also failed at keeping fuel in me. By the time I hit the fuel station, it was being torn down. I had brought gels and bloks with me, but didn't utilize them as I should. By the time you feel like you're out of energy, it's too late. Use your long training runs to estimate your needs. I've now gone my 2nd 1/2 this past weekend and I still missed my marks on when I should have fueled up, just not as badly as I did in January. For me, I've estimated that I should get some kind of fuel every 3-4 miles.