Another trick to nailing HMWYRS is to practice getting the transitional sections fluid - ie the position shifts. That was the hardest part for me, gave those sections their own dedicated practice time. Once i had learned to play all the notes of the piece and slowly, I worked at the right hand plucking, getting that even and up to speed, then I worked at 'joining' those left hand sections together.
It took me ages, I might add.