With Tesla, Musk invested in a neat startup, where the original founders didn't have the right skills to make it work and/or it was too soon for the tech, Musk managed to get the right talent in to turn the loss-maker and laughing stock into a decent middling output car company. That's fantastic! But it also isn't what Tesla is seen as by those who idolise Musk: he didn't make everything out of it; and even with all the talent, he found he got lucky that battery tech advanced as fast as it did and made EVs viable when they did.
One could argue he likely knew way less than your day job rocket scientist or battery experts when he started out. But these people believe so as long something is not impossible by known physics it is doable, and hence there is a way to get it done. And then they do it.
That is you wake up everyday, and do whatever it take to get things done. You keep moving forward, you keep taking the next steps.
Of course you need lots of other aspects of human enterprise like tenacity, productivity etc for all this. But once you get the root value right, all things descend from there on.