Curious, if you know that the solution isn't as involved regarding actionable steps, do you recommend being yourself and letting the chips fall where they fall? Or do you recommend something else?
From my experience, I would recommend a little different - Work on detaching from the outcome and the rest will follow. You'll have more confidence, you won't be surprised by or hurt by the outcome, and you won't be worried about what you say or do not say. Instead, you'll be authentically yourself.
That's not to say there aren't some things to learn. For example, arguing with a MLCr is akin to arguing with a teenager. May as well nail Jell-O to a tree. If you can. So if you know that, then calmly (see note on being detached and expectations) disarm the arguments. Try not to, but don't be afraid to, start arguments or attack a MLCr. Unless you've first mastered the art of nailing Jell-O to a tree. Then it may be safe to try.
You might also want to link MLC for dummies in your thread. It's a good, light-hearted bit of information worth noting when looking for a way to deal with boundaries.
Finally, you may also want to mention that boundaries are for you. Pick them carefully as you'll be tested. But once you pick one, mean it. I mean, mean it like you're the person they modeled Band of Brothers after and you're defending the hill. Be willing to die on that hill for your boundary, else don't set it.
As you work your way through this, you'll figure out exactly what you can and cannot live with. Chances are it won't be the things you thought going into it. I know for me, the cheating wasn't the biggest issue. That surprised me at first, but you really never know how you'll react until faced with something.
Life. Always an adventure!
AJ
"Our lives begin to end the day we become silent about things that matter" MLK Put the glass down... "Yesterday I was clever so I wanted to change the world Today I am wise, so I am changing myself."