We took the tour about four years ago. There’s a travel agency right near the Louve that has tours in all directions. We took another tour, one day, to a chalet south of Paris. I wish I could remember the name of the tourist agency but it’s quite handy, friendly, and does high-volume business.
Bring tissues. I cried myself silly through the entire tour. Surprisingly the German cemetery was very interesting and beautiful.
Point Du Hoc with the bomb craters still intact was powerful.