This is a job worth trying.
My buddy in his 70's and i did it together and neither of us had ever done this before. We decided that if we fail, it was going to be with abandon and enthusiasm.

Put the glass on a box next to the front of the car, inside down
Fit the seal, put synthetic grease in the trim groove and fit the trim all the way around. For the two top separate bits, start at the bottom corner and work upwards toward the join area.
Flip the glass around and insert the rope, making sure there's some overlap by about a foot. Some people like to have it wound around twice, which might help if you make a slip.

The glass guy I watched doing the same job now put butyl around the outside edge of the seal and glass cleaner on the inside bit facing topmost.
I used shaving cream as lubricant.

Roll up the rope ends and toss them onto the middle of the glass.
Pick up the glass with the help of a friend and set it down into its recess with the lip as close to the pinch weld as possible.
At this point check that the trim is still in place (I had mine slip out when inserting the rope which caused me a bit of a headache at the end)
Now, from the inside, pull on the rope nice and slowly, bit by bit left and right, checking everywhere that it's going in nicely, and having your assistant push vertically down on the glass, towards the ground not towards the dash.
Make sure the glass and seal is coming in deep enough for the lip to fold over the pinch weld, and if it doesn't, stop and push, and redo the missed bit with your fingers (or your second revolution of rope).
If the lip comes over the pinch weld, the glass will go where it should be going.

Before we knew it, the glass was home, and we hadn't broken it.

In the corner where the trim had slipped out, the seal slipped inward and I had to use the handle end of a spoon to lever the trim back into the groove. It is an excellent design principle. The trim ensures that the seal is kept square to the glass and doesn't slip down under tension. You'll know what I mean.