How do you install a window regulator in a cadillac eldorado?

i have 1999 cadillac eldorado an one window will not go up and the other wont go down. i recently took it to a shop and they told me to replace the regulators. and possibly the motor i purchase two regulators from a salvage but i do not know exactly how to install them.|||You can try to clean the switch contacts by spraying electrical contact cleaner into the switches. Then exercise them up and down hoping that's the problem rather than the window motors and regulators. If nothing else, use WD-40 to spray thoroughly into the switches on the doors.