4) Put the rubber on the car and then work the glass in to one side then bit by bit fold the rubber over the glass. 1/32" of progress at a time is huge! It gets easier as you go
Do you mean one left/right side? Wouldn't it be simpler to set the glass in the bottom of the gasket, then work the sides and top in?
On the other hand, I just messed up a $64 gasket on my '72 hardtop because it got too tight along the top after I put in the bottom and both sides. The 3M Windo-Weld butyl rope I put in the gasket groove was too thick I think. Have a new gasket and will try again without the sealer between glass and gasket. Could always squirt some under the lip later...
