For most triathletes, the swim is the worst part. You may find it to be good, though
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Just go into your "zone" and just do it as fast as you can. Once you're out of the water, everything gets a lot better
Put your swim goggles on
under your swim cap. Then you won't lose them if somebody bats them off. Although your nose/face might hurt, at least you can reposition them ... try to use more upper body in the swim. You want to save your legs for the bike and run.
And just like NBS said, keep your head in your transitions.
Set up your transition area bright and early so you get a good position. Try to rack your bike closest to the transition exit. That minimizes the amount of walking in your bike shoes. Make sure your bike is in the right gear for the transition exit, too.
Put your timing chip on before the race.
Pump your bike tires 10-15psi less than the recommended pressure because by the time you get to your bike, the air will have warmed, and the pressure should be bang on (unless it's not going to be a very warm day).
Put your helmet on the front of the bike or the ground. Don't forget that you cannot take your bike out of the rack until you've put your helmet on.
If you are wearing sunglasses, put those on before you put on your helmet. Then they will be under the chin strap and won't fall off when you take the helmet off in the bike/run transition area.
Make sure your gel packs are taped onto your bike in a way that you can just rip them off as you need them without tearing away any of the other gel packs.
Make sure you've got all your hydration loaded on your bike as well.
Do you have a bike repair kit? You'll need tire levers, CO2 or mini-pump, and a spare tube or tire (depending on the bike), just in case.
These are just little things, but they can make a world of difference
Hats off to you, TC!! GOOD LUCK!
Just have fun! Don't worry too much about your time. This is your first triathlon, so enjoy yourself!!!
I'm so stoked for you!