Do you trust the insurance company to tell you what's fair. The adjuster's job is to save the company money. For one thing, give you advice. The lawyer will first want to know when and where your accident happened. The lawyer might also find out if you've talked to your witnesses.
Strange things happen when a lot of time goes by before contacting witnesses.
They start to forget. Tell them who you are. Ask them for their help. Most will be glad to help you. The lawyer will want to know if the police were called to the scene.