1. I will not do anything... before the guest list.
It's not the most fun part of planning (and we'll be honest, it's one of the most likely to lead to a fight or two or twelve), but you shouldn't make any wed-day decisions before you have your wedding guest list somewhat firmly in place. Why, you ask? Well, do you want to have a nonrefundable deposit down on that cozy restaurant room that fits 75 when your mother-in-law's additions bump your list up over 200? Exactly. Once everyone's in agreement, then you can move forward. That said, this means that one of the parts of your wedding you can plan immediately (or at least talk over with your fiance) is what kind of atmosphere you'd like for your wedding. Do you want an intimate, close friends and family-only affair, or do you want to throw the event of the season for 300-plus people? Later, when you're in the guest-list trenches, this bit of planning will help back up your gut instinct about whether to say yes (or no) to guest-list additions.