Lots of memory cards. Don't be afraid to take charge... When you get ready for the formals, more than likely everyone will be waiting on your queue so be ready to take charge and setup shots. Have cards to give out to everyone that will ask you for one Get a feel for the location during rehersal... plan your movements etc.. Make sure things like Pianos aren't moved such that they are in your way. Give the bride the most attention, but don't forget about the groom/groomsmen, and the guests. Hope this helps.