My feeling is that the "progressive" nature of the material is more about building the shifts/pivots and increasingly closer intervals than necessarily the difficulty of each piece. Some folks might find the opposite true of the Rigaudon/Minuet comparison.
Probably better to not even be too concerned with the perceived difficulty of each piece but just take each one in stride as its own lesson and try to play it as musically as possible. After all, whether you're playing "Go Tell Aunt Rhody" or the Dragonetti Concerto, you should still be working on playing "musically", right?
Things really heat up towards the end of Vol. 2 and Vol. 3 has a number of wonderful pieces that really start to tie everything together. You're in for a fun ride!
Last edited by coldtrain : 08-06-2013 at 12:10 PM.