As CF pointed out, there is a lot of good information in the
LESSONS and other places if you poke around the site.
Boundaries, validation, conflict management, avoidance of circular arguments, etc. will all be useful tools for you to develop if you haven't already.
Also, reading the stories of others here may help you develop a clearer understanding of what you are dealing with.
If you have any specific questions, please feel free to ask. I'm sure that someone will have an answer.