After contacting a lawyer, the lawyer should conduct a full investigation as to how and why the crash occurred. This includes speaking with witnesses, obtaining the police investigation, obtaining photographs, considering all possible claims and theories of liability against any potential defendant, dealing with the insurance company for the persons who injured you, and filing a lawsuit if the matter cannot be resolved by way of a settlement. While the best personal injury lawyers should prepare you and your case for a trial, the best lawyers also work hard to obtain a settlement for you to consider.