GUIDANCE       Overnight success is usually the product of persistent unrewarded labor. The pattern is that without cash and connections, sweat equity at least sometimes creates breakthrough success. There is such a thing as the magic moment. The magic moment introduces itself with a premonition: you feel the breeze from the flutter of angel wings, you might say. (It's true that if what you are creating is a product, rather than a career path, well, then that product has to be useful to *an audi...