Smile when you fail
When you practice a new song, or even when you play one that you already know, you will fail.
At some point, you will hit the wrong key, mess up with the rhythm. Something won’t be good.
What I would like you to do is to smile when this happens. Not getting angry towards yourself, but rather smile.
Or even laugh.
Because it will shift your mindset, you will acknowledge your mistake without judgment, without getting tense (a good way to make even more mistakes).
Your mind will stay free and calm face to this error. Because you recognize it is part of the process, that it means you are practicing. The only thing that matters.
So you are doing good actually.
Smiling is powerful. Use that power to grow even higher and enjoy your journey.