I have been working on this Chopin etude for a few months now, and my first competition is coming up at the end of this month. Often, when I get about 3/4 of the way through (at around 1:05), my hands get really tired and I have to struggle through until the slight break with the 2 R.H. quarter notes. I was wondering about what I should do to improve my endurance/stamina and reduce the tension in my arm. In addition, other than playing it over and over again, how can I play it faster (do i need to?)?Any other miscellaneous performance tips/advice would be greatly appreciated! Thanks for listening!