The irony of this is that according to the official DSM for NPD, it's difficult to get a diagnosis for the person with NPD. Since the hallmark for diagnosis is the proven damage to self, and since someone with NPD would never DREAM of hurting themselves, and doesn't believe they are, since they are SO GREAT to begin with, the damage to others goes on, since it's not sufficient evidence of the harm. Such a challenging situation! It's like the caveat emptor in commerce -- only in this case, it's up to the potential victims to be aware and protect themselves.