I think the willingness to listen is really a matter of confidence. You can't be so superconfident in your abilities that you ignore what others say, and you can't be so diffident in your abilities that you think that if they say something, you will be so taken in that you will do the wrong thing. When you are confident about your abilities and also fully aware of what you don't know you are willing to listen to outside experts with the full sense that if you don't find it worthwhile you will ignore it.