Hey, guys!
My name's JJ and I'm excited to have made an account to post on this forum.
I've been playing piano for about 1 year 8 months, but I've only recently acquired my own
piano that I'm able to play on every day. I was only able to play maybe 2-3 days a week up
until last month due to my hectic work schedule, but I've been practicing almost every day since then and am seeing results!
I've been self taught and have only had one book to learn from, "How to Play Piano", by Roger Evans.
I learned some music by Philip Glass last year but am more recently becoming MUCH more interested in classical primarily by Chopin.
In the last few months I've learned Chopin's Op. 9 No. 2, and I'm a little over halfway through learning his Polonaise Op. 53.
However, I'm having trouble with what I believe to be my technique while learning to play Chopin's Op. 10 no 12 Revolutionary Etude properly. I've included a video for reference at the bottom of the page. I memorized the notes as of January and the speed and accuracy have been coming along, but my left forearm becomes very fatigued at about 1:25, and 3:00. Initially, I went back and relearned proper fingering for the song, and that helped a bit but during the chorus portion, my arm still becomes pumped. I've read on other topics on here that this may be due to not being relaxed, or not using the arms to assist in the pressing of the keys and only using fingers, elbows being above the keyboard, but I'm not sure if this is exactly what I'm doing wrong.
A couple notes:
- We have a piano upstairs; a Wurlitzer and the keys are very light on it. I was initially learning on this piano. I become fatigued less easily by playing on this piano, and also seem to have greater accuracy in just about all areas. Ive almost played through the whole song with minimal mistakes and much less fatigue at the end.
- I used to turn my hands to hit notes, but a personal friend who is VERY good at piano suggested I keep my hands straight when hitting notes for more accuracy and to be less prone to injury? So I'm making a point of relearning all fingering in the songs I've learned in order to keep the hands straight. This results in my hands becoming more rigid at times, though.
There seem to be tons of enlightened pianists on here and I would greatly appreciate any advice you may be able to give me! I don't think I'm doing too bad for the limited amount of practice and experience I've had, but it stinks not being able to play at 100% with my forearm being so tired.

I want to get really good!

Thank you!
JJ
I tried to stay off the sustain so you could hear it better in the video and it's full of mistakes, but please be honest and let me know what I can do to improve!