The challenges of building a business.

They are SO varied and thorough and often come at you from directions you didn't expect. And, as this is the basic nature of almost any complex endeavor, you really have to learn to adapt quickly to as much as you possibly can. There might be a premium to be put on a quality dose of preparation but simply preparing for change and "the unexpected" seems to be the most beneficial type of preparation, in my mind. Change never stops!(my clunky, non-inspired version of the obviously oft-repeated sentiment)