I have done ground up restorations, rebuilt engines and transmissions and any other advanced automotive task you can mention BUT I will not touch anything to do with window mechanisms. They can turn into a nightmare in a heartbeat and scare me to death.
However if you wish to tackle this then here are the disassembly instructions. Of course you would not have to do all of it to access that dent though.
https://demos.starbase7.net/t3Portal...35217316511084