Do you have a passage you are working on that seems impossible to learn? Then treat your brain as a 4-year-old. Take the passage, look at it objectively and ask yourself what is the essential frame of that passage.
Let me give you an example. In Debussy’s Claire de Lune, there are chords that creates a climate build-up with an accelerando (gradually getting faster) and crescendo (getting louder). These are in measures 19, 21 and 23. It can be tricky to play them clean. So the best way to learn it is to first play them as simple octaves. That way you get that the octaves are not so difficult to play and that the measures are not really complex. Once your hand gets the hang of it, add the other notes in and you will be surprised how much easier it has become to play them.
When we have to explain something complex to a 4-year-old, we don’t use complex words: we try to make things as simple as possible to have a proper communication. When we make things simpler, it creates clarity. Clarity is strength. Always work with a goal to simplify and to clarify. Your playing will improve faster.