If you've never shot a wedding I have two suggestions. First, look through some wedding portrait and pose type books and get some ideas. Don't be afraid to try something creative. Second, use 400. You won't have grain problems with today's film, 400 will do both in and out nicely and the one less thing you have to worry about, the little bit more you'll be freed up to see what's going on around you. Weddings can move at a hare's pace and you don't want to miss it by wondering which film should I load. Stick and move. KISS. Good luck.