What mjames said.You prepare to learn these larger works by actually learning the work itself. Don't give yourself two years, what happens when those two years are over, do you stop learning? Set the goal of simply learning the piece. You might get it to an acceptable standard to where you would perform it for others within two years, but you certainly don't stop learning the piece - it grows with you over an entire lifetime of playing music. There is a lot of material in this piece to really dig into. After the technical challenges have been taken care of, then comes the musical challenges. Thinking about what you actually want to say about the piece.
What a waste of time. Just learn the piece and use what's in it to learn it. Really the only section that requires "stamina/endurance" is the coda, everything else is pretty standard for someone who's been playing for 8 years. You don't need multiple pieces for it, just get into it right away.If you want to learn his etudes, do it, but don't do it to "prepare" for other works because Chopin's etudes can be pretty tedious during the learning process and they're concert pieces in their own right.
What a waste of time. Just learn the piece and use what's in it to learn it. Really the only section that requires "stamina/endurance" is the coda, everything else is pretty standard for someone who's been playing for 8 years. You don't need multiple pieces for it, just get into it right away.