You should hire an attorney as soon as possible. An experienced car accident lawyer will give you good advice on how to deal with insurance and medical providers. During the first few days after the accident, there will be a lot things said and done that will make a big difference in how willing the insurance company will be to offer you top dollar for your case.
For example, when you seek out medical treatment — and you should seek treatment — you will want to tell the doctor everything that hurts. You might think that some of the bumps and bruises you have are unimportant or that they will simply get better in a few days. The problem is that sometimes the little things are what lingers. Later on in your case, it will be important that your medical records accurately describe your injuries. If you do not tell the doctor about an ache or a pain until a few weeks after the accident, the insurance company will not believe that the injury was caused by the accident.
An experienced attorney can also help you know when to talk to insurance companies, and when not to talk to insurance companies. These are important decisions and it is a good idea to have someone with experience to guide you. Avoiding little mistakes in the beginning will make a difference at the end.