The switch is stupid simple. Reach behind the dash, unscrew the little bolt that holds the switch on, then pop it out. Unplug it. Look closely and you can pop the back off the switch. Open it up, clean it, put some dilectric grease in it, put it back together. If it's the switch that should fix it.
You may just have a broken wire somewhere, though, so while the switch is out test the power to the window by jumping the plugs.