Users & customers validate #2 better than investor opinions. Whether or not it's viable to experimentally build depends on the domain, but if this is holding yo

Users & customers validate #2 better than investor opinions. Whether or not it's viable to experimentally build depends on the domain, but if this is holding you back, you can choose an idea with a low startup cost. Finding a team also helps validate the idea. Bouncing your thoughts off sharp colleagues is a key step in honing your idea. Once they're excited (about either you or your idea) you pop the question.