Start slowly, keep the wrist FREE!

This piece is a good practice, because you'll have only one finger acting - at the same time - on the left hand. This will enable you to concentrate in your right hand: Play while your wrists are free and loose! Start slowly; practice this piece every day for few months! (Up to 15 minutes a day).
Later, try few right hand fingering combinations like: p - i a m and p - m i a.