Lots of good advice has been posted. I just want to add that it is nice to get another perspective too. Sometimes one photographer will envision a picture one way and another a totally different way. So it is cool to get two totally different pictures at the same time! When I started offering a second shooter for our packages, brides were really excited and have loved getting both of our artistic work. I generally shoot with another photographer so that we can capture all the different things happening, sometimes at different locations, collaborate on ideas together, especially since time is sometimes very limited. With some photographers shooting for travel costs, it is an especially great time!
Katie