pre 96? considering you can add the feature to the passenger side, you can take it away from the driver's.
http://www.bfranker.badz28.com/fbody/expresswindow.htm
i can't tell you exactly what you have to do, i'm not sure what the factory wiring is like on the driverside, but you should be able to take your time, figure each wires purpose, and get it working correctly.