Fake it Till You Make It
This one resonates with us because it illustrates that you can achieve anything if you set your mind. Doubting your qualifications for that job? Convinced your crush doesn't feel the same way about you?
The OP serves as living proof that leaping is worth it. You might encounter failures, and that's okay – they provide valuable lessons. Conversely, you might exceed all expectations, including your own, by taking that chance.