Excerpted from the article:
Practice does not make perfect, "practice makes permanent," Teri said. "Don't practice until you get it right, then practice until you can't get it wrong." How do you get to that stage, where you "get it right?" Here are a few ideas: Start with tricky sections. Identify the problem. Use the metronome. Remember that most mistakes happen between two notes. Play a section and stop right before the mistake, then sing the next note. Practice in rhythms. Record yourself. Repeat, a lot!