If you have ever contested a sprint you know how easy it can be to loose. The best way to improve your chances is to not be seen.
There is a lot to be said for anonymity in a race. Sit back in the pack and try not to draw attention and convey a non threatening vibe. Work your way up before the wind up and ride just to the right of a sprinter or lead out. The typical view of the lead out or fellow sprinter is to look over the left shoulder. Wait for the last 100 meters and dive to the left and give it hell.