I did my own divorce. It cost me about $500, and most of that was court fees. I had a free consultation with an attorney in the beginning. He wanted $7000 for a retainer and told me it could easily go as high as $15000-20000. I decided to try and represent myself first, and if the need arose, then I would go the expensive route.
I won't lie to you, doing it myself was not easy. Court paperwork and proceedings are confusing as he11, even though my AH didn't put up much of a fight. But, in the end, I got what I wanted and it didn't bankrupt me. So, I would say it was worth it.
Divorce laws are highly subjective and specific to each state, so others' experience on this board will probably not prove to be useful to you, unless you are in the same state.
L