Those are tricky the first couple of times.
I'll assume you have all of the hardware, and tracks.I spent a lot of time degreasing mine, then coating them with fresh grease, mounting them again and again to get the feel of how they needed to load and operate.
It was a lot of trial and error on my part, with some cross reference from my body manual.
What I did was loosely installed the window and guidetrack.
In this picture you will note that my lower L bracket Wichita mounts the guide track to the body is from the opposite side of the car, but it will show you how to get the window down all the way.
There are two bolts on the guide track that control the bump stop for the guide assembly.
Loosen those, then drop the window.
Hope this helps.
Dan