Many people decide to take a stab at handling their personal injury claim without an attorney. That usually turns out to be a bad idea.
Why would an insurance company be concerned about you suing their insured (the person or company that injured you and whom they insure) when you are not a lawyer? Why would an insurance company pay you fair and reasonable compensation for your injuries when they know you don't have the leverage that an experienced attorney provides? Why would an insurance company not try to trick you since you don't regularly handle personal injury claims?
Representing yourself is never a good idea. Hiring an experienced personal injury attorney will send a message to the insurance company that your case is not to be taken lightly.