I will tell you the easiest, fastest way to understand narcissists and other Cluster Bs like borderlines and histrionics. All you have to do is grasp the following sentence.
The types of things drug addicts and alcoholics are driven to do for their substance of choice (lie, steal, betray, etc.), are the exact things a narcissist will do to get narcissistic supply.
In fact, one of the best ways to undestand how narcissists work is to study drug and alcohol addiction. This is because all narcissists are addicts (for narcissistic supply), and all addicts are narcissists (addiction makes people self-centered and lose empathy). Much of what I’ve learned about personality disorders came from reading about drug and alcohol addiction and mentally replacing the words “addict” and “alcoholic” with “narcissist” and the words “alcohol” and “drugs” with “narcissistic supply.”
Give it a try and you’ll see what I mean.