Just unscrew the lock button from top, remove all handles (Phillips screws), gently remove from door careful not to break pins around door trim and you should have it
.
Is your window electric? If so maybe the motor has come loose my rear window on my wagon had simmilar problem and I had to replace the winding mechanism worn out, pain in the bum
to do , be careful can be sharp if worn or maybe motor needs replacing . Good luck ;-)
regards
BB W123 wagon