Are you sure? I'm not sure because I don't have NPD although I think my dad did, and it seemed like he was that way, based on what I understood of his deprived childhood.

I think what is needed is an ability to consider other people's opinions realistically, especially those who are close to me. And, when there is some indication I have done something that I'm not especially good at or proud of, or a result that I'm not especially proud of, then to take that into account, both in my view of who I am and in things I might try to do differently another time.