During last night's first meeting of the Big Artist Workshop, gentle genius Chris Wells (hey! he won an Obie!) shared the most useful hack I've ever heard of for dealing with one's art as a focus-challenged person:
Don't worry about letting go of things; think instead of what you would most like to move toward.
Like most shifts in thinking, it will probably end up being profound because it is so simple. I have trouble letting go of stuff, because the decisions are too painful. So I don't: I now turn my attention toward the one thing I am moving toward right now. Those other things? Those other ideas for projects and stories and songs and books and demands on my limited attention? We'll talk about what they're for later, when we understand it. For now, it's enough to know that I can safely move toward this one thing.
The class was full of so much goodness, it fairly blew my mind.