I lived in the same house with my no ex while we were going through our divorce, a total of 14 months. Our divorce started off bad but became very ugly, but due to our temporary agreement that we had in place it was impossible for either of us to move out until the divorce. One thing we looked at early on was filing for bankruptcy, but didn't, I'm not recommending it but if it is something that you will need to do it's better to do together before the divorce. My divorce was two years ago, and I'm SO much better now, it might look overwhelming now but you don't have to figure everything out today, just deal with issues as they come up and you will get through it.

A couple of pieces of advice.

To the extent possible try to keep things civil, things might turn ugly, but don't be the one that takes things in that direction.

And this is a big one, knowledge is power, do some research about the divorce laws in your state, many lawyers will give you a free consultation, take advantage of that to educate yourself. If you can work out an amicable divorce without lawyers it will be better for everyone, but knowing the "rules" is important.

Make sure you understand all of your financial information, bank accounts, debts, investments. Take steps to protect yourself, there are a lot of "dirty tricks" that people can play during a divorce, don't do them but make sure your protected from them.