Okay, well, if the regulator and all the track guides are in, it's just a matter of placing the glass in. If the glass still has the big "guide" (the piece that fits in the rear guide track), that will have to come off. Once that's off, the window should fit in the door. Once it's in, you can reattach the guide for the rear track. Then it's a matter of getting those window nuts and bolts in. So far I have the two rear in mine. I'm having a bit of trouble with the front one. My arms and fingers are pretty beat. Patience and perseverance (and a few beers) will go a long way. I can try and get some pictures of mine, but like an idiot, I didn't get any as I was doing it.
Hope this makes sense.
66 Impala SS