1. Get long sparklers. This ensures nobody is as likely of getting burned, plus it allows more time for great photos!
2. Make sure you communicate to your guests you want them to stick around to the end. Nobody wants to set up a wonderful send off only to have 17 people there. The people that are there love you—ask them to stay for your send off!
3. It sounds bizarre, but anticipate going through the line twice; once for the shot and once to just enjoy it and soak up the party vibe as you leave the reception!