Today's tip is a quick one, but one I wish I had been aware of earlier. While self-tanners and DHA are a good way to tan for competitions, do not use old lotions or sprays. Pay attention to and take care of your skin. Some people are allergic to self-tanners, and even if you aren't allergic, they might irritate if they've gotten old. About a year and a half ago, at my first competition after a couple years' hiatus, I gave myself a nasty rash on the inside of my elbows with some Super Tan. I assume that that particular bottle wasn't good any more, but I switched to a new brand anyway.
My current favorite is the Rude Nude shown above, available through DSI. A bottle lasts me through about six competitions, or about six months.