No, the dents are typically fixed from behind, but it is rare that a trim panel needs to be removed. In this pic here you can see the blue handled tool inserted into the door between the window and door skin...I use a window guard to avoid scratching the glass while making the repair. I don't normally recommend an owner trying to fix their own body damage, it is very easy to cause additional damage in an instant and the damage caused is usually irreversible...For usually 1/3 to 1/2 the $$ of a conventional body repair, I'd say just hire someone with experience...
