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Autozone will also read the codes for you for free (saves you the cost of buying a scan tool although they can be nice to have) and if they are not busy I've seen them look up the meanings too not just give you the numbers. At least the stores I've been in will read codes for free. But if they at least give you the codes then you can go to one of the saturn forums and find out the meaning as well as what diagnostics go with it.
Depending on what the manufacturer did you may have the wiring in the door already to just add factory power window motors and maybe change the regulator to the power window one then add switches and plug a fuse into the fuse box. Don't know if Saturn has done this but I've seen a couple of GM trucks that had all the wiring there since they used the same harness in all the trucks.
If you go the aftermarket route and use something like the autoloc kits they usually come with a plug for the door panel hole that had the window crank in it. Not the best cosmetic solution but it can save you getting new or used door panels if you can live with the way it looks. And some of the kits even come with an emergency handle that you can stick in that hole in case the motor or wiring fails and you need to roll the window up.
I've taken my share of door panels off and while it's not the best working enviornment it's definitely possible. If it's your first time the main thing is to take your time. If it feels too tight you probably missed a screw somewhere or need to pop off another trim peice before you take off the whole panel. And I can guarantee that a Saturn door and panel is lot better to work on then most any european car door panel.
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