Relax. Trust your wedding photographer (Me :)))
If you’re relaxed, it’ll come through in your photos.
Leave some breathing room in your schedule so you don’t feel rushed — I recommend a minimum 30 minutes for family and wedding party photos (about 5 photo’s) and at least half an hour for the couple portraits.
Oh, and get plenty of sleep and drink lots of water the night before.
Take it easy meeting up with friends and family the day before. Wedding-day hangovers are not fun.