I can't attest to PM (but there are succcess stories on here for that!) but for the "regular" lesson stuff, here's a suggestion with the caveat that it don't work for EVERY student:
Forget perfection. Like the pre-boiling pot, don't watch it. Like a playful puppy, the more you "ignore" Perfection and just go with it, the closer the puppy will come to you till finally it's cuddled up in your lap, asleep. (Disregard the above if you plan to become a concert pianist!)
Next, re-shape your practice time: ALWAYS have stuff on the music desk that's "yours" and not part of the regular lesson source (think of it as supplementary materials.)
You might focus less on rote and drills and more on melody and fun (as long as it doesn't interfere with what you HAVE TO get done before the next week's lesson!)
Have a piece on your desk that is easy and fun, and have one that's just a weee bit beyond where you are right now so you'll have to stretch a bit (but not so difficult that you become frustrated and give up. If you find that your difficult piece is TOO difficult, just file it in your music files for "later when I'm a little better" and revisit every couple of months.)
The secret is to enjoy.
Like kinky sex and diet food: if it's "painful" it ends up costing you more in the long run
