How to prepare for divorce

I think I’m done with this marriage. The last 3/6 years has been miserable with him. And i resent him more and more everyday. I’m not even sure if he realizes how not into the marriage i am because he’s so into himself. We’ve talked about my unhappiness and his behaviors that contribute to my unhappiness with him and he always blames/ brushes things under the rug. Most days i just avoid him or half assidly engage in convo.

How does one prepare for a divorce mentally and legally. We have 2 under 2. Not really worried about custody because he doesn’t do much for them now and with his line of work no way he’d get them over me.