Good advice for myself, not just for art, but just about everything else I do:

Lesson 1: Don’t Be Embarrassed

I get it. Making art can be humiliating, terrifying, leave you feeling foul, exposed, like getting naked in front of someone else for the first time. You often reveal things about yourself that others may find appalling, weird, boring, or stupid. People may think you’re abnormal or a hack. Fine. When I work, I feel sick to my stomach with thoughts like None of this is any good. It makes no sense. But art doesn’t have to make sense. It doesn’t even need to be good. So don’t worry about being smart and let go of being “good.”

Lesson 5: Work, Work, Work

Sister Corita Kent said, “The only rule is work. If you work, it will lead to something. It’s the people who do all of the work all the time who eventually catch onto things.”

I have tried every way in the world to stop work-block or fear of working, of failure. There is only one method that works: work. And keep working.

Every artist and writer I know claims to work in their sleep. I do all the time. Jasper Johns famously said, “One night I dreamed that I painted a large American flag, and the next morning I got up and I went out and bought the materials to begin it.” How many times have you been given a whole career in your dreams and not heeded it? It doesn’t matter how scared you are; everyone is scared. Work. Work is the only thing that takes the curse of fear away.
How to Be an Artist 33 rules to take you from clueless amateur to generational talent (or at least help you live life a little more creatively). Via kottke.