The negotiations can be delicate with some give and take.
My final negotiations were done at the courthouse prior to a status hearing. I stood in the hall while my L worked with my W and her L in a conference room (my W was a B according to my L). He came out to discuss with me a few times and it only amounted to me paying some back child support of $2400 as to their final wants. That was proabably how much it cost that day just for both L's to travel to and from the courthouse and spend time negotiating so I said yes and then we went before a judge who praised us for coming to a judgment on our own and said that our D would be final in a week or so. Using the court to decide would have been very costly and I am happy that both L's were very professional.