Tips & tricks for taking out 71 Dart door window?

I might be wrong.. I think you'll find the vent window assembly and door glass all comes out together. Only 1 small fastener holds the door glass to its regulator.
It's a 2 piece plastic thingy. In my experience, pulling the center pin out of it always breaks it. Using a small punch to drive that center pin clear through doesn't always break it. Even if... it is reproduced and the least of your worries.
Finding all the hardware that holds the vent window assembly in is the tough part for most.
My advise is take your door apart first so you know what tools are needed at the parts yard.