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If you want to live with them, you can't realistically micromanage everything the narcissist does or says. You also can't just let them treat you however they please. So, where's your middle ground? Figure out what narcissistic behavior you can't tolerate. For example, you may be able to tolerate them dominating conversations, but you are not able to accept when they insult you. Narcissists are infamous for walking over people and abusing their goodwill, so you need to know your limits. Once you've identified your boundaries, make a list of the situations in which the narcissist tends to violate them. By writing this out, you will know which contexts you need to be wary of. For instance, the narcissist may be more likely to manipulate you in front of a group. Noticing this pattern can help you learn which scenarios to be on guard against. It also helps you figure out how to phrase your boundaries. Now that you know what you can not tolerate, communicate those boundaries when the offensive behavior happens. You might say, "I can see that you're angry, but I will not tolerate insults. If you continue to insult me, I will leave." State your boundaries with confidence, lifting your chin, making eye contact, and keeping your voice strong and steady. That way, the narcissist knows you're serious. Narcissists will cross every line you make, so it's important that you actually follow through with consequences. If you've said you'll end the conversation, disengage. If you've threatened to leave, do so. Setting consequences doesn't have to be the end of the relationship, you can tell the narcissist "I'll be happy to continue talking when you are able to communicate without insults." Keep in mind that enforcing consequences may not cause the narcissist to change their behavior. More than likely, the narcissist will still test your boundaries, no matter how strongly you set them. Stand firm despite any pushback. For example, the narcissist may insult you anyway just to see if you will actually do anything about it. If this happens, you must enforce the consequences to show them you mean what you say. If you waiver on setting boundaries, the narcissist won't respect you. True narcissists think highly of themselves, but they are also entitled. They believe they deserve attention and admiration and may not care who they hurt to get it. They cannot tolerate criticism, but may regularly belittle or demean others to make themselves look better, Being a little self-obsessed or high in confidence is common, but these traits are different from full-blown narcissism. Pay attention to who they spend their time with. Narcissists tend to be in relationships with people who won't speak up and stand up for themselves.
Identify your boundaries. Make a list of the things your narcissist does that cross the line. Voice your boundaries with confidence. Enforce consequences as needed. Expect pushback, but stand firm. Know how to identify a narcissist.