Just thought I would add my two bits worth to the conversation.
I separated from my missus of 13 years last August and have two boys 9 and 7. Under the definition of "hell hath no fury like a woman" is a picture of my ex and her female lawyer. She was a completely absent mum to the kids yet she is doing everything possible to keep them from me, destroying their mental wellbeing in the process. And she wants 65% of everything because she reckons I brought nothing financially to the relationship despite working fulltime because she was too lazy to work any more than a couple of days a week, and selling a brand new Patrol and boat to buy a house.
9 mths in and we are probably down about 35k between the two of us in legal bills with no end in sight.
For mediation and settlements to work there has to be negotiation and an agreement, and my experience is that unless the man backs down there is no agreement because they are vile evil stubborn bitches with no intention of doing the right thing for the kids. And in the eyes of the law and child support agency, if you are the dad then you are completely screwed no matter how much you have tried to do the right thing.
Apologies for the rant guys, but being in the position I am in I can only offer this advice. If you look like going down this path do absolutely everything you can to keep the communication open and keep it amicable. But, most importantly, get legal advice early, proper legal advice. Don't just go for the free advice lines and try and manage it yourself for a few months and then find out she was in the lawyers office three days after the split because it takes a lot of work to make up that ground and you will get reamed in the meantime.