Pick a subject that is stationary. Like a monument (use a tall step ladder with the platform on top)
Practice circling with the front kept facing the platform on the ladder (as in staying on a subject) and learn to rise and drop slowly as you rotate around the object.
A step ladder with platform also makes for a nice landing pad for precise landings on a spot.
Practice rising approaches, and rising fades back and up. Practice passes that rise and sweeps as the front yaws at the object.
Sounds easy... you will find out how hard very quickly it actually is.