I filed my own paperwork and got a divorce in Gwinnett about a decade ago. If the couple has an agreement, with no children, you can simply go up ti the courthouse/justice center, and get the divorce petition from the clerk of the court (superior). Take it, fill it out, get both of you to sign it, and get it notarized. Return it with the filing fee (was $63 back then) to the clerk. Wait 2 months (minimum amount of time to wait). Go before the judge (only 1 of the 2 people needed). Confirm you still want the divorce. Sign the final paperwork.
It's not very hard. All of these lawyers that advertise "uncontested divorce - $499", are just filing this simple form for you.

Gwinnett Superior Court:
http://www.gwinnettcourts.com/courts/supcourt.htm
Court Forms:
http://www.gwinnettcourts.com/lib_asp/volumeindex.asp