That’s what it really comes down to.
You have to believe in yourself, work work work and work some more until you finally get to where it is you want to end up. And if you fail or fall along the way pick your self up, dust yourself off and keep going with the knowledge that you will make it. If you think about it, there really are no other options.
Ok, you’re right, there are. And you can dwell on them and make a long list of all the reasons that you can or should fail. And that’s where you’ll end up.