If you don't subscribe to HBR's Tip of the Day, you should. Today's tip hit home for me. You have to be good and then great at what you are doing now before you move forward. AND in the process, it is ok to fail. That 4 letter f word isn't a bad word; it is ok to not succeed at everything on your first try. If I had succeeded at everything I tried, I would be living on the ISS right now.
Trying something new can be daunting, especially if you fall short at first. Before you get frustrated and give up, remember that practice really does make perfect. To achieve perfection, stop focusing on it. Instead, try to enjoy the process of trying. If you want to be a great manager, you need to enjoy being a poor one long enough to get good at it. If you want to be a stellar salesperson, you need to spend time being a clumsy one first. You can achieve anything as long as you are willing to enjoy striving for it along the way.