Another way to think about it, is practicing at the edge of your skill / knowledge. If you can already do x, then you are at a good position to learn to do x +

Another way to think about it, is practicing at the edge of your skill / knowledge. If you can already do x, then you are at a good position to learn to do x + i (where i is an incremental improvement over x), by practicing x + i until you can do x + i. Rinse, repeat.