Lay out what you'll need for the ride on a small towel next to your bike. Practice transitions to see what works for you. Put your helmet on your aero bars and sunglasses in your helmet. Make sure shoes are undone so you can put them on fast. Put an energy bar on your saddle to remind you to refuel right away.
Some suits come with a padded crotch area for the bike leg.
It won't flap in the wind while riding and isn't too hot for the run. On training rides, practice reaching behind for a bottle. Practice riding sockless to get used to the feeling. Your pace may fall off slightly once you get to that point, but you'll still be going faster than you were originally. Relax your shoulders by rolling them back and dropping them.