Oklahoma City is in Oklahoma County, Oklahoma. The court of last resort is the Supreme Court of Oklahoma, with 2 intermediate appellate courts. Every state allows self-representation in most civil matters, and Oklahoma publishes official help for it.
You are allowed to do this yourself
Every state, including Oklahoma, 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.
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Geographic data from GeoNames (CC-BY 4.0). DocketX products are research and explanation tools available online everywhere; we do not have offices in Oklahoma City 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.