NOTHING is too hard to play on the piano!.......
This is true. Any “impossible” piece can be made easy if one knows how to do it.
The Secret:
1. Play it WITHOUT PEDAL
4. Then, somewhat prior to performance time, add pedal here and there (like salt and pepper), only as needed to buttress any remaining/unmanageable legato problems
I agree with Lostinidlewonder. Without qualifications, this advice is absurd. Then again, is he suggesting this as the secret to learn Mazeppa, or to learn any piece at all? Buttressing of unmanageable legato problems is just one of the functions of the pedal, mostly applied to Baroque and Classical pieces. The creation and manipulation of overtones (which will result in colouristic effects) is by far a much more important use of the pedal. That is how it is used in most Romantic and Impressionistic music (try leaving the pedal out until somewhat before the performance in Debussy and see what happens). As such it has to be integrated from the very beginning (this is not to say that practicing without pedal is not a good idea – but one must know why one is doing it).
2. At the same time: Play it AS SLOWLY AS IT TAKES TO PLAY IT WITHOUT ANY ERRORS (in timing and/or note values)!!!!
3. Then keep this up UNTIL (say 3 months from now) it is being played at the desired, but error-free, speed
This is of course a most absurd way to go about practicing any piece. It is very inefficient and it will build up speed walls, ingrain bad technique and will prevent proper memorisation. Perhaps what he means here is that
after one thoroughly learns a piece, then it is a good idea to play it slowly – and in this case I could not agree more.
However, what happened to the real secrets? (Break down a piece into manageable sections, some as small as two notes; practise hands/voices separate before joining them; using dropping notes to co-ordinate hands, work on the difficult sections first and most, etc. etc.)
What happened to analysis of the piece, carefully thought out fingering, exploratory practice to determine best motions and co-ordinations – all of which cannot be done if you are playing the piece from beginning to end, no matter how slowly?
Three months from now, using this “secret” will almost surely guarantee that the student will be completely stuck on speed walls and wrong techniques (since at slow speeds you will get away with wrong motions).
Use the proper way (it is no secret: read my posts) and you may master this piece in two weeks instead. (Provided it is within your level).

Best wishes,
Bernhard.
P.S.:
PLEASE TELL ME THE technique you used to get the scan file of this piece so nicely?
Yours
Dr. Thomas
Nothing is too hard to scan on the scanner…
The secret:
1. Position the document on the scanner. Do it without pressing any buttons.
2. At the same time: Adjust the document AS SLOWLY AS IT TAKES TO MAKE SURE IT IS PERFECTLY ALIGNED IN THE SCANNING AREA!!!!
2. Then keep this up UNTIL (say 3 months from now) it is aligned at the desired, but error-free position.
4. Then, somewhat prior to scanning time, press the start button, only once to scan.