Organization is a Plus

The more organized you are, the less chance there is that something will go wrong. Buy a notebook to keep all your wedding information in it. Receipts, contracts, ideas, etc. You might also want to get notebooks for your maid of honor/bridesmaids, and maybe consider one for the best man. Put info such as dates, times, locations, and duties. This will keep everyone organized as well, and minimize the chance of someone missing a fitting date or rehearsal time.