When anyone starts their flight training, they are going to find things challenging, regardless of what type of helicopter they are learning in. Yes, the R22 is a little bit less stable than the H300 or Enstrom but if you have no experience at all, you can't judge this lack of stability until you can fly and then compare them. The R22 makes good pilots. If you can fly the R22, you will master every other machine. You never know, you might be a natural talent and the Robbie will present no problem to you at all. Good luck with your training.
500 Fan.