Just like when you are the only car in the parking lot at the ball game. Otherwise, you will probably get lost. Many bikes look alike. Many people look alike, especially with dark glasses on. Make a careful mental note of where your bike is racked.
Regular pedicures help too.
Well you can practice running without socks like you should in the race. Socks work great on your typical jog, but wet socks and wet feet spell blisters during a triathlon. Lubricating your toes and heels with vaseline is helpful. If there is no one in your age group in front of you, it is likely that you won. To confirm, listen for the sound of one hand clapping when you cross the finish line.