If you wish, ask me how I know to give the following advice after you read it......
If you guys have decided to call it quits, there's no more reason to fight. You no longer owe her ANY part of you, what-so-ever. You no longer owe her any of your emotions, good OR bad. Starve her of any of the intimate part of you she is familiar with.
Sit down with her, be humble, be alouf and be strong.
Find out what she really wants to take away from dividing the assets of the union and then just give and take. You'll end up doing the same thing via expensive lawyer in court, so you might as well try to work it out between you now.
Don't let her wind you up. Remember, no matter what she says, now you can just turn and walk away . SHE HAS LOST HER POWER OVER YOU.
You don't have to agree, and you don't have to disagree. You just need to get through this particular discussion. The discussion you two are currently engaged in, the "battle" so to speak, and if walking away and picking it up later is what must happen, do it.
This, or any other one particular discussion won't decide the "war". It will take many to come to a truce.
If you must, leave her there simmering in it. Go back later and try again.
Eventually she will understand that arguing and pushing your buttons won't work for her anymore. She will find that she will have to actually sit down with you (with or without lawyers) and work a deal out.
Oh, she WILL try to push EVERY button. Don't buy into her negativity and by all means, don't feed into it. You're going to want to, believe me, but DON"T DO IT!
And if there are kids involved, the fighting REALLY needs to stop.
Divorce F's kids up, no matter what, it F's them up. try to do as little damage as possible.
Be civil to each other for them. Dislike each other all you want, but don't involve the kids. It's not their fault you two can't find a way to get along anymore. Remember this and you're 3/4's of the way there.
Good luck to you!