There's a lot to consider for your wedding day, or really, any big life happening that's going to be documented through hundreds of photos that you'll want to look back on forever. You want the right dress, the right hair, the right shoes, the right makeup. When you're making such an effort, planning ahead to look your best, it's easy to go overboard on treatments and services too close to the event. And it's just as easy to overlook little things—like the fact that you should stay far, far away from the sun beforehand (see #4!)—that can have a big impact on your overall look (not to mention photos).
Before I go on, there's one universal don't I should mention: don't forget that you're beautiful! Have fun!