Confidence versus Cocky

Have you met people who were cocky? They can be some of the most obnoxious people ever. Yet you want to be confident. Where is that balance?

In my experience the confidence is in things you know. The cocky comes when people are confident and either wrong or have no experience in the area. It is difficult to know when you know enough to be confident (There are always people who know more than you do, and you do not know what you do not know).

There is the opposite when you have people who should be confident and do not share their skills or knowledge. So I guess it comes down to balance and sum of your experiences.