You can't go back and do it again if you find that the photographs are not suitable.
As a backup measure, most of your friends and family will bring their cameras or cell phones to capture the moment. Some of these candid shots can make for some great photography.
When employing the services of a photographer try to find one that comes well recommended to you by trusted friends or family. Call on the photographers references to confirm the recommendations.
Look at their wedding album and see whether you like the arrangements and the quality of the photos for yourself as everyone has different quality standards. What might seem good for one person might not be good enough for you. Check out the photographers particular style because they all have their preferences and these need to coincide with what you want.
Make sure that the photographer has backup cameras in case anything goes wrong with their equipment. Even though this might seem very obvious, it has happened on many occasions where photographers have had equipment failure on the wedding day with no alternative backup to save the day.
Take your time to interview any prospective photographers and make sure that you feel comfortable with that person. The photographer will be in your presence all during and after your marriage ceremony and you want to make sure that you like them well enough to endure that.
The World's Top Wedding Photographers: Ten Top Photographers Share the Secrets Behind Their Incredible ImagesThe Art of A Wedding: How Brides Can Get Award-Winning Photos at Every Wedding: From The Eyes Of A Wedding Photographer500 Poses for Photographing Brides: A Visual Sourcebook for Professional Digital Wedding PhotographersThe Design Aglow Posing Guide for Wedding Photography: 100 Modern Ideas for Photographing Engagements, Brides, Wedding Couples, and Wedding PartiesThe Wedding Photography Checklist (The Wedding Planning Checklist Series Book 1)Wedding Photography Unveiled: Inspiration and Insight from 20 Top Photographers