Being intelligent is like having a knife. If you train every day in using the knife, you will be invincible. If you think that just having a knife will make you win any battle you fight, then you will fail. This believe in your own inherent ability is what will kill your startup. Success comes from the work and ability you put in becoming better than the others, and not from some brilliance you feel you may have within you.
So don’t believe that the brilliance of your idea is what will make you successful. What will make you successful is when you are out there every day, doing something new, challenging yourself, trying new methods, studying new ways, having a lot of small failures, then getting better every day.