Don't you have PDR (Paintless Dent Repair) facilities in France? I think that kind of repair job is best left to professionals equipped with the right skills and tools to repair your dents to perfection. Most often they don't need to remove your inside door panels as the PDR tools fit inside the window cavity with no problems.
Check out
www.dentwizard.com for more information.
Are you in Paris? By the way I love your country. I have been there 3 times, including my honeymoon.