whats actually wrong with it? the lever is missing? or it doesnt wind up and down?
If the levers missing just get one from a wrecker easy as.
If it wont wind up and down then get the window mech from the wreckers.
Take off the door trim theres like 3 bolts? or so that hold it in place with the glass in a channel, take the mek out replace it with the new one, reseat the glass, done.
Its really not a difficult process, if you can get someone on here to help you out, better half of 2 hours.