Don't even engage a lawyer yet. Get an estimate (written) on your repair costs, and send it (certified) to the guy who hit you. Write that he send you the check, or work it out with his insurance, within 3 weeks, otherwise you will sue him. Be polite but bloody firm. Credible threats go a long way - if your damage is under 3K or so, you can always ACTUALLY go to small claims court yourself, without the aid (and horrible expenses) of a lawyer.
Its not your fault. Its his.