On my last post, David King (fellow Blogger) commented "You're done when you've communicated it, but that's the bit you do not know!"
I think his comment is very valid. I will think on how to communicate that to potential readers of my book without getting too complex. I’m trying, mainly, to provide a book that will get people “doing” their art, not worrying too much—at first—about the product. So it focuses on the process, which is more directed at the “do-er.”