The most effective way to do it, is to do it.
Quality is not an act, it is a habit.
Expect problems and eat them for breakfast.
Who seeks shall find.
Be gentle to all and stern with yourself.
If you think you can do it, you can.
Either you run the day or the day runs you.
You never know what motivates you.
The wise does at once what the fool does at last.
Be thine own palace, or the world's thy jail.
There's obviously nothing wrong with selling your art - only an idiot with a trust fund would tell you otherwise. But it's confusing to know how far you should take it.