I fish Gilmer often, like the others said be careful. With that being said I do run the whole lake...you can run parallel to the road and once you get to the bridge of just past it take a hard right, there are a few visible stumps to avoid between there and the first pocket, I swing into that pocket just a little bit and then head for the high lines. There is on huge stump close to the high lines that you'll be able to see...after the lines its open, just don't run into any of the pockets.
BUT make sure you make a couple of idling passes first and get a good line to reference on your gps. This lake can bite you if you get too comfortable!!