I really want to thank everyone for weighing in! I'm sorry I didn't get a chance to check back yesterday (super busy doing birthday stuff). I took everyone's advice, plus similar suggestions from various articles around the web, and ran the whole thing, taking it easier the first mile. That part couldn't be helped, actually--they started everyone at the same time and it took forever for the pack to break up enough to get an even pace. ANYWAY, it was a very enjoyable run, the hills looked A LOT SCARIER from the car than they did on foot (the hills on my normal route are way, way harder; they're *shorter,* for one, so they're steeper.)
It was not a very fast run (I've done better in my last 3 races), but my *standings* were a PB--usually I'm pretty much smack in the middle, all across the board (totally OK with that!). But today I was slightly better than dead center for the whole race, and
in the top 20% for my age/gender!!!
I'm taking that to mean it's a slower course and I did really well.
...Also (pep talk), the fact that I got up at 5:30 to go running on a holiday says way more about me as a person than the fact that it took me a little over 10 minutes to run a mile today.
And DH got me this for my birthday: