There are several benefits to hiring a Personal Injury Attorney. Some of them vary depending upon your case.  The most significant benefits are:
Hiring an attorney will stop the insurance companies from harassing you;
Hiring an attorney will often result in you no longer having to deal with medical creditors or their collection agencies;
Hiring an attorney will sort out what needs to be obtained or done to get your case ready for settlement negotiations and/or trial;
Hiring an attorney will bring a professional with experience to your side in all dealings related to your claim.