Pull a shop rag down behind the window crank, and drag it around the shaft. Just make sure you have your hand ready to capture the clip when it comes out of there at about 100 MPH.
The panel slides past like 87OldYeller says.
As far as the glass, the base that holds the glass will slide out off the rollers. You will need to unbolt the bottom of the back track, and the window regulator. To install the new glass. Slide it down into the door, feed it onto the rollers, then feed the door rollers into the track on the inside of the door. Then rotate the regulator until the four regulator bolt holes for it line up with the holes in the door. Start them, roll the window up, put the rear track bolt back in, tighten the regulator bolts. Reinstall the panel.