Practice in tranquility.
Mozart is the most inaccessible of the great masters.
Children are given Mozart because of the small quantity of the notes; grown-ups avoid Mozart because of the great quality of the notes.
The notes I handle no better than many pianists. But the pauses between the notes - ah, that is where the art resides.
I always make sure that the lid over the keyboard is open before I start to play.
When a piece gets difficult, make faces.