Those of you that are learning on your own from books, videos, and whatever else you decide to use, what is your overall approach to art study? And how do you deal with problems like: -Knowing what to study, when, and for how long? -How do you keep the difficulty level appropriate--not so easy it's boring but not so hard you spend most of your time spinning your wheels and losing morale -Tracking your progress and actually being able to feel the sense of progression