Irrational self-doubt vs. and honest recognition of one's limitations?

A funny thing about reality is that it works. So when we get big headed and don't know it, usually reality will win out and we learn what we can and can not do. And what one might be able to do is no indication someone else can do the same thing. It takes all of us doing what we can and cant do to find the way that works for all or most of us. Some of us learn from this and some don't. If you want to do something and don't try you will never know.