Fescue is popular around Atlanta, however it usually has to be overseeded every fall. Lime is very important and is cheap. I would mulch around the trees as wide as possible.
The keys to fescue in the south are ....
Lime early fall late fall late winter early spring late spring
Fertlize late Janurary and 1 time per month until the end of May. Then wait till September to fertlize again
After the last frost....... BAG all your grass clippings. Do not irragate during the day. Mow as high as you can......Do not mow when wet.