There’s a small difference between increasing your success rate and just increasing your confidence. That difference is the willingness to fail.
The reason I say that is you will only improve after a failure. After you feel that your best isn’t good enough. Only then will you understand that working harder isn’t the answer. You have to do something different.
More knowledge, on the other hand, will only make you feel that your right. And it will cause you to work yourself to an early grave. The whole time wondering what you’re doing wrong.
So what do you do? Learn just enough to get started. Then learn as you go. Make learning your reward.