If you want to learn how to do rolling harriers that is easy, I call it the 3P method, practice practice practice. Ok, lets get serious, it is a function of keeping your fingers to the speed of the plane, which is controlled by surface deflections and throttle. I would start by doing rolls and never stopping, you should be able to do rolling circles, roling figure 8's etc. If not get that down, then do them slower, slower and then slower maintaining altitiude and then you will start to see how fast your fingers need to move, and that it requires alot of deflection. Start with a straight line and then go to circles and then do figure 8's with them, it will come just use the 3P method. Jeff Williams