When I had my psychopath arrested, the cops kinda forced us into contact with 2 social workers, one for me, one for him. Unfortunaly he lured them both in aswell, and the so called mediation-sessions always ended up in more advantages for him, never for me.
Eventually I refused more sessions and handed it all over to my lawyer, much to the dismay of the social workers, who told that those "arrangements" made during the "mediation" were valid until the divorce is final. One of those arrangements was that my daughter and me had to leave the house 3x weekly for 2 hours so he could be there and when I told this so called social worker that this was very stressing for my daughter and me and if this could be cut down to 1x per week she simply told me to move out than and leave the house to him!
I was like "yeah right", but avoided any further discussion and my lawyer requested in court that the house would be assigned to me - he of course contested it, but I won, exchanged the locks and now this house is officially mine (and my daughters of course).
The divorce isn't final yet, it's gonna be a long battle, but it all goes through the lawyers now, no personal contact required. And I have no urge to see him or to have any sort of contact with him. I don't miss him at all.
So yeah, my advice would be to avoid the mediation/social worker route if you're dealing with a psychopath-divorce - go straight to the lawyer and play it as hard as you can and have to. A psychopath will be tough to deal with, let the lawyers deal with this, they do have the personal distance to sort it all out. They don't get emotional about it.
Put all emotions aside for the divorce ordeal. If he calls or messages, don't react. Just ignore. Also ignore what kinda gossip he spreads about you and walk with your head high. Let people see that you're doing well, this will hurt his reputation especially in small communities. You don't need to dig a hole for a psychopath - they're excellent in doing so themselves. My psychopath ex now goes for underage-girls - just a matter of time for him to be ruined.
Get to know the social networks in your community if he still lives there. And don't be ashamed of what happened to you, if people ask for your side of the story, tell them. Not in all details of course, but if there was domestic violence, don't hold it back out of shame - YOU have nothing to be ashamed about.