Accomplish Anything - The Not-So-Super Power

I’d like to think I can do anything I put my mind to, but who really knows? That’s not to say if I could choose a super power that I’d pick this one in particular, but it would be interesting to possess such blind confidence. On the other hand, fear (of failing) is the most-cited reason for not accomplishing something. Interesting paradox. Should we just advance in life with rough abandon, without so much as a second guess? I wonder where the middle ground lies?