Everyone seems to have really sensible advice. We don't know what happened in your past, but intuitively I would say that you be careful with yourself and maybe try resolve that before moving into dynamics with other people...
In my case at least, I found that willingly putting myself in a situation with others, and opening myself up to that risk etc., brought up a lot of weaknesses, amplified them and made me look at them THEN AND THERE.
Polyamory has a way of poking a finger right into the things that hurt the most. In that sense I think it's an amazing way to grow and change as a person, but if you're not feeling grounded to begin with, maybe make that your priority...?
I think in time, this stuff gets easier, but with my SO's now ex-girlfriend, it never got easier, because it was never something she fundamentally wanted. And so it wasn't a constructive struggle towards something, but just her hurting herself.
I think you're wise to take it slow
Perhaps this could be an opportunity for you to heal some of those past hurts?