Ahhh fun times...hahaha
I did this a few months ago took everything off/out then with the door glass channel un bolted i installed the window glass run i left it unbolted and then i got the regulator in not bolted i only got it in the door then the glass i really dont know if its the right way to go but it sure seemed the right ne at the time and besides i was doing it on a sunny day and mid day so i didnt want to be all damn day in the sun trying to get the glass in...after i mannaged to get the sash channel aligned with the regulator rollers i bolted the door glass run, also i would be nice to remove the vent window assembly too it gives you more room to operate and besides that thing can still be placed after the window and one more thing get a second pair of hands you might need it i sure did and nobody was home at the time.
