The only pre-wedding jitters I had weren't jitters...I was stressed out over the monumental amount of money exiting my bank account for this and that. I felt very lucky that the gifts made up for it, but man, that was a hairy few days.
Whatever you do, the very worst thing you can do is show frustration with it all, and throw your hands in the air. If she gets the impression that you really don't care, you're in for much trouble. It's your wedding too. This is the very biggest day in a woman's life, and she takes it very, very seriously. Just go with the flow, you'll be alright.
As you already know, my friend, I'm only a phone call away.