Deep breaths Maple. I'm hoping Puppy stops by tomorrow since he is the go-to guy for logistics.
My first instinct is to lay low and see what's on his agenda. Just prepare yourself to be calm and non-reactive. Practice your validating statements and be prepared to leave the situation if it gets ugly or if you feel like you're about to lose your cool.
Did you settle on an attorney? If not, get some names and leave vms asking for appointments Monday morning. If there's anyway to get H and the girls out of the house tomorrow (breakfast?) use the time to do your own digging.
FWIW, I'm all for boxing all his stuff up and putting it out of the house. I'm not sure of the legalities but as long as he isn't either, he'll either go with it or at the very least have the hassle of bringing it back inside. And if you think it's necessary, put a lock on your bedroom door.
I put BF out of our house. I simply packed him a bag, took his housekey when he was in the bathroom, then announced that I wanted him out. I'm sure that I had no legal ground to do so since the house is in both of our names but it wasn't a request and he damn well knew he deserved it so he just left. Your H seems like he may not have the decency to feel guilty but you can certainly try it.
If you love somebody, set them free. http://tinyurl.com/2empx2g