Taking out the glass...
Remove the door panel, remove the window motor and extract it from door. You will have to rotate the motor for it to clear...brace or block the glass from dropping. Remove the window channel gasket to find pop rivets securing the frame to the door. There are four rivets...drill them out (two on top, two on the side)
Once the rivets are out the frame can be tilted to remove the 1/4 glass and gasket.
Note: if the frames have never been out, there is bonding material that has most likely dried like concrete on the mating surface of of the frame...I had to use a cutter to free up the frame from the door.
Take you time and go slowly...refitting is another adventure, I suggest a helper when you are ready.