Get help if you can. Even if you are not an expert, do the best you can. Ignoring the parts of business you know least leads directly to failure. When you are building your dream, don't rush off and show it to enemies. Work the bugs out of it in conversation with your friends and allies.
People best implement ideas they have a hand in developing.
People support projects they help create. Don't leave key collaborators out of the loop so long that they have no role in developing the plan. Think it through, anticipate objections, and then incorporate their creativity and help. The role of the entrepreneurial leader is a continual dance between the dream and reality. You can cleave so strongly to current reality that you abandon the dream.