I'm at 37.5k miles on my 08 automatic, and drive in the mountains and desert all the time. Per the manual, I'm supposed to get an oil change and an auto tranny fluid change. I think I can handle the oil change myself, but the ATF seems a little more intimidating, and the folks at AutoZone eluded to removing the bottom part of the transmission, replacing a gasket, etc. but they didn't have any specific info or parts for the Aveo. Is this something that is easy to do in the Aveo, or should I bring it somewhere to get it done?

I replaced the spark plugs without a problem, and think I can swing an oil change, but I'm not mechanically inclined by any stretch.