As an Atlanta DUI attorney, I can tell you that without an attorney, chances are slim to none that a DUI gets dropped and you are allowed to plea to a lesser charge. The prosecutors have absolutely no motivation to allow it- it is their case they are trying to win.
Depending on the facts, surrounding circumstances, and where your specific case is being tried (what court), a DUI dismissal is definitely plausible with the right case preparation. If you would like a no-cost review of your situation, feel free to contact my office- I will be happy to give it to your straight. You can contact me through my avvo site, or at 404 642 6333. There are also some things you can start doing to better your defense- my profile should have my "3 Proactive Steps" guide. Get started; it will only help your situation.