Skills and money help, but it’s also a matter of personality, including whether you even want to be that person. And it could be that your particular idea is out of reach for you at the moment, but there are other businesses you can start with fewer prerequisites. It’s not clear whether your goal is “execute a specific idea” or if it’s a more generic “run your own business”. If it’s “run your own business”, rather than fixating on a single idea, look for an idea that you can afford to pursue. You can always get back to the other one later.