Emancipation: Wisconsin Emancipation

I'm a 17 yr old girl and I want to be emancipated. I'm 3 months from being 18 and I need out now. My mom and stepdad make my home life extremely stressful. I'm still in highschool i'm in my senior year. I'm taking math at the college in town and I have 2 jobs. I pay my own insurance, phone, gas, taxes, a lot of my food, and clothes and I believe I can support myself. I'm not sure as how to go about getting emancipated. Do I just leave and when they call the cops to collect me I argue that I'm capable of supporting myself or what? I have a place to go free of rent until I get a place of my own and my fiance can move in with me and help support us as well. I just need help. I'm desperate and I've been putting up with this for a long time and I can't continue to function under the stress its causing me.