Learning too much about the materials is a mistake, in my opinion. I've noticed the people who become preoccupied with all of that are often not very good artists. I see an over-reliance on value studies and planning as largely a waste of time. Worrying about what others will think is very bad. The idea of "purist" watercolor has nothing whatsoever to do with art, so obsession with that is obviously a mistake. There is the notion that painting everyday has some inherent value, but I don't agree. I'm not saying it's bad, but painting for the sake of painting does nothing for me.