2. You need to ask a lot of questions: "How do you attach your bib number?" "Where are the bathrooms?" "Where do we line up for the start?"
3. No matter how cold it is at the start, it's worth dressing lightly because you're going to get very hot very quickly.
4. It's really hard to drink water from a paper cup while running. It's also hard to grab a paper cup from a table while running.
5. Hill training is not an optional technique if you plan to compete.
6. Familiarity with the course is more helpful than just knowing distance in terms of gaging progress.
7. It's amazing to see people who you'd never guess could even run around the block pass you, quickly.
8. The toughest 100 feet are those leading to the finish line.
9. The cheering, fatigue, heat and crowd at the end is very disorienting. I forgot to stop my Garmin so it continued to record long after I had finished the race.
10. You may get very hot during the race but you'll cool off fast. Put on more layers as soon as possible.
Those are the things that I remember the most. I'm sure, after my next race, that I'll have a few more to list.