Door pannel/ window motor- seen this B4
 

I have a 1987 Mercedes Benz 190 Turbo Diesel, 5cyl 2.5 l. I love her

The front drivers and rear passenger windows will not open because the motors are broken. I want to replace them but cannot figure out how to safely/ properly remove the door pannels. If anyone out there could tell me how to remove door pannels I would greatly appreciate it. There is only one scre i can find. I think the rest are clips but I have no idea how to use them or get to them. Thanks.