It is not music's function to express rational necessities.
I practice in my head.
Practice in tranquility.
Have I a secret about playing the piano? It's a very simple one. I sit down on the piano stool and make myself comfortable - and I always make sure that the lid over the keyboard is open before I start to play.
When a piece gets difficult, make faces.
The sonatas of Mozart are unique; they are too easy for children, and too difficult for artists.