I would propose that building a business requires — (1) 'business-kind' things such as a differentiated idea which has a market demand, great team to execute, capital et al, and (2) it requires at personal level, a lot of sacrifice and enormous amounts of energy. I want to talk a bit about (2) right now.
World wants you to be typical, and pulls at you in a thousand ways, it wants you to be at equilibrium with itself. Building a successful business implies not being typical, it also implies lowering entropy in some small way in some small part of the world. So, in that process, you are fighting nurture and nature.
And that requires lot of personal sacrifices in trying not to be typical, and it requires lot of energy (physical, mental, emotional) to continuously fight the natural entropy. You have to decide and prepare yourself for the personal sacrifices you would be called to make. And you have to decide how you would create, preserve, and multiply your energy reserves.
Most people don't make it through this fight not because of the idea or the team. Because they underestimated what it would cost them personally.