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

I just installed my back glass(70 swinger).I sprayed the gasket groove down with soapy water and put the gasket on the car,then placed the glass in by slideing it in the lower groove has much I it would go.Then i had a ice scraper handle that I used to work the gasket around the glass.A duster should be alot easier because the swinger has pointed lower corners that was a huge pain.Just remember its glass dont force it,put all the pressure on the gasket as you work it around not on the glass.
BTW I did put a rope in the groove of the gasket but I was working alone and could not work the rope right,it kept just sliding out so I scrapped that idea and went the other way with it.Some even put the gasket around the glass and work the gasket onto the pinch welds of the car but that lower strip is harder to get to.This is what I done hope it helps.