I only know 2 people that are poly & what I see the most in them,compared to monogamous people, is their ability to be extremely open. Especially regarding jealousy. It's a huge emotion & can be deadly. Most don't like to discuss but, but I do understand their ability to take the emotion, pull it a part & exam it openly. I can see that as being key to a poly relationship & for me, trying to emulate that ability to talk so openly.
One has explained the feeling of compersion to me which I've been trying to understand & study more.
I'm sure you're scared too, but you know communication is key & keep going with it!!