With the breaks and extenders removed the plane will fly level, it just wont slow down as fast for landing. I learned on my own on the computer and without an instructor. (Not recomended by a lot of people here, but.......) I bought my nexstar the 1st week of Jan this year and I too already own and fly 3 other planes. Its an easy and stable flier. Enjoy.
Oh, and spend as much time on the computer as you can!!