The easiest thing of course would be to ditch the narcissist(s). They're not going to change. Sure, you can learn ways to set boundaries, and that's a great skill to have in dealing with anyone, but even if you get good at it, would you even really want to be around such a horrid person? You speak in the past, so I'm not really sure what tense to use, but you get the gist.

The other thing I have found from personal experience is that there is a lot of manipulation, and if you fend them off one way, they simply move to another manipulative tactic from their bag of tricks.

Are you free of this woman you mention? I worry for your safety.