“An expert is a man who has made all the mistakes which can be made, in a narrow field.” - Niels Bohr
Don't be afraid to fail, to test, to experiment. This is what teaches you things you cannot learn from books. Everything written, told, heard are things somebody already know. If you want to be better in something you have to do things that nobody did before and push those boundaries as much as you can.
So true: “Management is doing things right; leadership is doing the right things.” - Peter Drucker