Jessica,
Changing your name on your drivers licence is very easy. Two things are needed:
1. A letter from your doctor.
2. A court order.
I recently changed my name in Miami-Dade county. The county has a family court that handles divorce, paternity and name changes. The court website in your county should have information available to do this without a lawyer. Total cost is about $ 465.
I had 15 certified copies made. So far, most agencies just scan the certified copy and give it back to you. If you have to mail the certified copy to some agency, do not expect to see it again. I think maybe 5 copies would be sufficient. Just keep the case number and you can get more copies if you need them.
Feel free to PM me if you want to discuss this further or have difficulties.