If you want to do it yourself, there are two ways. The easy way, and the right way. The easy way is to pull the door panel, and use your fingers to gob grease in the rails. This has worked fine for my drivers side, but didn't do so hot on my passenger's side. The right way, which I did to the passenger's side, involves pulling the window and rails out of the car, and cleaning and lubing everything. I used to think I was mechanically inclined, but doing this REQUIRES two people to get the window back in, and will result in dents in the garage wall when you throw things trying to remove a part of the lock that lets the rear rail out of the car easily. I never could get mine off. There is another way to do it, pulling the rail out of the front, but it can get very annoying and cause you to spout obscenities for no apparent reason. Almost as bad as trying to remove the lock thingy. I would try the "gob grease in the rails" idea first, as that lasted me about a year. Alos note, it is very hard to hold the window in place when you have grease on your hands, and your wife does not have the strength in her hands you think she should........
For the right way, grab a friend, a VERY good friend, and do the other. Everything works great on mine now, although the passenger's still does not go up quite as fast as the driver's, and above 120mph I get some wind noise from an improperly adjusted window pane. (on my list to do when/if I have to pull the door panel again)
Good Luck, and if you need any more info, let me know.
Tom