Well, the doors of a 69 are the same as a 70. I've been working on mine the last couple weeks (completed driver's side) & here's what I've learned.
1. Some sources say take the vent/side window out together. This will work for sure, but since I'm working alone, I did mine separately (lighter). You can remove either vent/side window alone (either order)
2. Vent window first:
a. remove (or severely loosen) 1 bolt & 1 nut behind the two plastic plugs, on the inside of the door, right near the hinge area. NOTE: the nut (lower) attaches to a triangular brace that bolts up inside the door with nuts in the door jamb area, near top hinge, in hinge area of door. "might" have to loosen those nuts too, but probably OK not loosening them.
b. remove the tiny plastic plug, inside the door, near the main vent window frame. There is a hex-head bolt behind that plug that also needs to be loosened. (nut, bolt & hex bolt are main 3 attachments)
c. Probably a good idea to at least loosen the "pin" at the bottom of the main vent window support. You access this through a rubber plug under the door. The pin is attached by a big, moveable "speed nut clip"
d. Roll side window down
e. tilt back on top corner of vent window slightly & pull out vent window frame
3. Side window first
a. remove little rubber "corner" at top of vent window (one screw - the top one)
b. remove the screw right beneath the top screw from (a)
c. with side window most of the way down, push out the plastic pin inside the plastic glass-to-support attachment area. Once plastic pin is removed, you can push out the main glass attachment piece which just pushes through the glass & it's support (now glass will be free, so try not to let it fall into door..no big deal, but you'd hate to break the glass)
d. roll window all the way up (or close) while holding it from falling inside the door.
e. lift up glass evenly & out of door, remembering that you have a "run channel felt strip" coming up/out of the rear vent window frame.
HOPE THIS HELPS!