One thing I didn't see mentioned (might have missed it) is being confident in a harrier from all possible angles. If you can do this, you will learn the rudder inputs very well. Try flying straight out away from yourself in a nice harrier. Slowly turn around and bring it straight back in a good high alpha harrier. Do this a number of times and get good and comfortable.

Then start increasing the nose up attitude of the plane until you are almost into a hover. After you have done this for a while try to just "pop" it up while doing the high alpha belly in harrier. Hold it there and drop down into a harrier again.

For giggles go around and do a regular hover; when it starts to turn on you, you'll be surprised how much input memory you have learned by doing those drills.

Another way would be when it starts to turn, push it around with aileron until the belly is away from you again where you are comfortable. This way won't force you to learn the proper inputs though and you still need to be comfortable with a harrier as a "Bailout" move. If you can harrier confidently both upright and inverted, then you should be able to get out of most any hover or Torque Roll situation..........assuming you still have power!

Hope that helps!

J.