YW welcome Candi - anytime.....
Remember - a lot of this 'complication' people mention isn't specific - or specificly related to poly etc.
It's just about human interaction skills. Even getting along with friends & family takes some people skills, patience, sometimes discovering our own selfishness, non-confrontational communication etc. And sometimes the closer we are/become, the more we tend to forget about the fact that we STILL have to practice those skills. We'd hope that we all 'understood' each other better and could eliminate them but it just isn't the case ! That's when trouble surfaces.
The more everyone understands and agrees with this, the easier it is to call something out before it becomes a huge issue and tackle it together as a team. Honesty, openness, kindness, tolerance. Patience.
Go for it !