What you think will happen will not happen the way you believe, and when it all hits, and your product is selling, or not selling, or there is some other problem, then you stop, you need to look at the data objectively, and then you decide on how to change your business, or as they say in the "in" crowd, Pivot.
Pivot is simply taking your business and when an idea doesn't work, changing directions. The worst thing you can do is drive your business in to the ground because you refuse to admit that the first idea, made back before you had the information you had today, was not that great.
Success goes to the tenacious, the networked, and the ones who can adapt.
It is that simple.