What are you doing that it takes 2 hours? There are six bolts including the two holding the glass and another six or so holding the door panel on. 1 hour to remove and replace. Slacken all four bolts on the window mechanism. Remove the right hand side of the mechanism, the one without the motor off first. Pull the top of it to the centre and down over the other and lift it up and out of the opening. Pull the bottom of the right hand side.towards the opposite side and lower it down and then lift up through the opening..
Reverse to install. Four bolts on the motor.