The AT-6 is a low wing trainer, and a pretty good choice for a second airplane. If my memory serves me right, the CMPro AT-6 ARFs tend to run rather large (1.60 cu in 2-stroke?), so jumping right into one after starting out on a .40 or .60-sized trainer could be a bit intimidating. You might find a low wing .90 to 1.20 sized plane to be a good warm-up before tackling such a large ARF.

If you actually have a smaller CMPro AT-6 ARF in the .40 to 1.20 size range, you should be able to fly it once you're completely comfortable with taking off and landing your trainer. It's always a good idea to find some expert help when learning to fly a new model for the first time, I've buddy-boxed my second and even third planes until I was comfortable with how they handled.