Couple of other thoughts...
-For a half marathon and longer, don't worry too much about warming up. You are going to be amped up, particularly considering it is going to be your first race. OK to get rid of some nervous energy, but more than that and you run the risk of using energy that you will need in the race. Warm ups diminish in importance as your race length increases.
-Along the same lines, you may have to force yourself to slow down a bit the first couple of miles. You will feel great and want to let it out. Resist. You want to let it out over the last 3-5 miles, not the first.
-Don't pin your race number on too high on your shirt/top.
-I advise taking water at most, if not every stop, even if it is only a single swallow with the rest being dumped out or poured on your head. If in traffic at all, wait until the middle or end of the water station (usually a couple of tables long) to grab a cup. Say thanks to the water station volunteers.
-Agree with the Alan T advice to smile and have fun. Give kids high fives.
-Wait until you are several steps past the finish line to stop your watch or phone. I know you are a data freak, but many a finish line photo has been ruined by a head down, frantic grasp to stop a watch at the line. A few seconds won't matter in your run tracker database and your official time is going to stop because of the chip.
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