Her: "I'd like to go over the divorce details." Me: "Sorry. I'm not ready yet." ---Discussions Ends---
Don't negotiate anything when you're emotional. Don't get into discussions when you're emotional. Nothing good will come of it. That's the way I approached things. It worked out well for me (albeit from a rebuilding my life perspective, rather than a marriage saving perspective).
As for validation, I have no doubt it is powerful and effective. It just seems like a whole lot to pull off in the thick of things. Or maybe I just wasn't any good at it.