Alfred,
I have taken the glass out several times with the rails still attached.
It is a matter of tilting and angling the glass with channels out of the door.
You can remove the guides inside the door, as in my case I needed to do that because the two metal guides on the glass had come off. (These are famous for falling off)
Baron,
Congrats on getting it out. And lucky you, with a good and patient wife.
Wish mine were patient like yours.
Walter
1967 220SL diesel