Oscar Peterson gave me one of the most important lessons in my life. He said, "Never look for results when you practice. When you practice, the only thing you are only trying to accomplish is putting in a certain amount of time on your instrument." You don't look for results because what you practice today isn't going to show up in your playing until six weeks from now or months from now. You might be working on a Czerny exercise, and after three hours of practicing, you didn't make any progress. The point you need to keep in mind is that you got three hours in. so you just try to put the time in. Maybe a few days from now you go in, and "BANG!" you can play it.