Custer is in Yellowstone County, Montana. The court of last resort is the Montana Supreme Court. Every state allows self-representation in most civil matters, and Montana publishes official help for it.
You are allowed to do this yourself
Every state, including Montana, allows self-representation in most civil matters. What defeats people is not the law, it is the process. These tools exist so you can walk in knowing what each step means.
Keep going
Geographic data from GeoNames (CC-BY 4.0). DocketX products are research and explanation tools available online everywhere; we do not have offices in Custer and this page implies no local presence. Not legal advice and not a law firm. If you can get a lawyer or free legal aid, do.