replacement of back passenger window on 1995 Mercury Cougar

how do I replace the back rear passenger window on the drivers side, without taking it to a glass shop? They want over $400 for that small window.

Asked by for the 1995 Mercury Cougar
The process is rather hard to explain in words i could thou provide you with some pictures and diagrams with instruction make a request at under forum i would start by taking out the door panel.