Separating is tough especially when you've had so much history and good memories together.
First, I'd look for a good lawyer who can help arbitrate with divvying up your assets and deciding on custody of your children and visitation rights.
And then... Oh, wait, you're looking to slim down your collection?
Haha! I'd just get rid of the Marie Kondo book. That thing seems like a useless waste of space on your bookshelf.