Window

First step is to get the door panel off, chances are the problem with the window regulator will reveal itself then as well as possible solution. If it's a broken part you'll need to access it anyhow, and if it's just a loose or disconnected part you should be able to see it. Door panels are usually held in with a handfull of screws/bolts as well as blind plastic rivets. Check inside armrest for screws and along bottom edge. Then use a pry bar to pop the plastic rivets. It's inevitable some of them will tear, don't worry you can get more at any auto parts store. Good luck.