Not only that, but bootstrapping, and building a v1.0 that's the smallest thing that's useful, and then iterating over that while listening to your customers.

Basically, use the product development process as a way to find out about the market. Basically, use it as a way to acquire what Eric Ries calls "Validated learning about customers": http://startuplessonslearned.blogspot.com/2009/04/validated-...