Being an entrepreneur is no different from any other kind of leader, and step one in both cases is to manage your state. And the biggest key in managing your state is ensuring you only feed your mind with quality questions. Ask questions that contemplate the outcome you would like, rather than questions designed to dissect and dwell on what you don't want.
Just before the holidays I had coffee with Anne, an ex MBA student running a fairly large product group at a search engine company, now out trying to raise money for her own startup. She had an interesting insight: existing content/media companies were having the same problem as hardware companies that rarely made the leap to new platforms.