If there are two things music has taught me, it will be hard work and patience.
I have been involved on and off with music since I was 6 years old and it has given me joy and happiness.
When learning a difficult piece, one has to work hard by practicing and being patient until your muscles and your brain embeds it into their memories and then it will just click.
Like in life, whatever you want to do, you need hard work much more patience to achieve certain level of mastery.
If it gets hard, keep going, one day it will click.