Hi.

My answer will really reiterate the general consensus. I do believe that polyamory can work. It is hard work. There has to be a genuine, honest part of you that believes in it to make it work.
I have been in my poly relationship for just over two years. Most of our arguments are related to polyamory. In the early days, they were jealousy arguments. Then they became expectations arguments. These days, when we argue, it tends to be because we are miscommunicating. For me, at least, it has evolved and improved over time.
I have had many moments where I have questioned whether polyamory is right for me. The thought of monogamy petrifies me these days. I just can't trust that relationship model.
Have you thought about the reasons you want to be poly? I haven't read your background posts yet, so I don't know the details of your situation.
When things get rough for me, I remind myself of my core values:
1. I don't believe in ownership of a partner;
2. I enjoy my own personal freedom;
3. I don't trust that monogamy works; I would rather deal with the pain of poly than the pain of being cheated on;
4. I want to grow, and polyamory helps me face my insecurities and become stronger.