Any tips or tricks to installing rear window and seal on a 71 Duster?

I'm going to install my rear window on my 71 Duster this week and could use any tips or tricks to make the install go smoothly. Its a new seal. Is it best to do the string trick? Would i pull the string from inside or outside car? I ask because of the lower inner "lip" of the seal is 2" or so. Any experienced advice would help. The front windshield will be done by the glass company doing the windshield.