Parkrempler – Get experts?

Hi, I’ve been the victim of a parking ramper. Luckily, I was just getting off when it happened and thus on site. Now I have a question / a problem The woman drove me in the rear right into the bumper. So put on the rim with the bumper, the bumper slightly pressed in and then passed it with a few scratches. As it is, the victim always remains on the track. Now I have the problem, however, that I do not know if I have an expert limp According to the law, damage below 750€ is a “bagatelle”. So under 750€ the expert is not paid by the opponent insurance. What makes more sense: Workshop estimate without experts and then report to the opponent insurance OR let experts of the opponent insurance come (which is for me free in each case)