Hi Sarah,
First, I don't have a direct answer for you, because I have not done so myself. But it may help to get around or get to know so photographers that have done so already.
Are you a part of an online art community? I am a member at DeviantART.com, I believe it is the largest fastest growning community in the world, pretty amazing--there is no place else like it. It doesn't cost anything to join. Just a thought.
But if you want to do it more independantly, I am sure there are some professional photographers who have done interviews where this question might be addressed. I'll search around a bit, because I am kinda curious about it

Let you know if I find anything!