To cope with a Narcissist is a full time, energy and emotion-draining job, which reduces the persons around the Narcissist to insecure nervous wrecks. No one, to my mind, not even the most brilliant, charming, breathtaking, suave Narcissist. The glamour and trickery wear thin and underneath them a monster lurks which sucks the affect, distorts the cognition and irreversibly influences the lives of those around it to the worse. Others delineate a more sweeping dichotomous strategy. Both philosophically and pragmatically, we cannot and should not assume responsibility for other people and their lives.
Narcissists are incorrigibly and notoriously difficult to change.
Trying to change them is a wrong strategy. The two viable strategies are either accepting them as they are or avoiding them altogether. If one accepts a narcissist as he is - one should cater to his needs. His needs are part of what he is. The Narcissist is an emotional invalid.