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These aren't very hard at all. Pretty basic design unlike some of the former Pontiac models. Two 10mm screws hold the glass to the regulator. Door panel has two large phillips heads in the middle of the door panel and of course clips on the outter edges.
OOPS...it is a GTN, not GTY. ATI glass we have no problems with fit, it's the attachments on doors and Trailblazer/EXpedition backlites where the hardware is either laying in the box or comes off while installing.