Answer:
If you are an individual, you may represent yourself in bankruptcy court without an attorney (this is also known as "pro se"). Keep in mind that, while individuals can file a bankruptcy case pro se, it is extremely difficult to do it successfully as the rules are very technical, and a misstep may affect your rights. Bankruptcy has long-term financial and legal consequences. Hiring a competent attorney is strongly recommended.
Corporations and partnerships must have an attorney to file a bankruptcy case.
You may contact the Oklahoma Bar Association for more information and referrals.