Something experts in all fields tend to do when they’re practicing is to operate outside of their comfort zone and study themselves failing. The best figure skaters in the world spend more of their practice time practicing jumps that they don’t land than lesser figure skaters do. The same is true of musicians. When most musicians sit down to practice, they play the parts of pieces that they’re good at. Of course they do: it’s fun to succeed. But expert musicians tend to focus on the parts that are hard, the parts they haven’t yet mastered. The way to get better at a skill is to force yourself to practice just beyond your limits.
Via Gust MEES, Jose Luis Anzizar