Door glass and wing window removal

Trying to remove door glass and wing window assembly. I have removed the three screws at the front of the wing window. It now appears as if I need to remove the bolt anchoring the forward vertical door glass Channel to the door. I'm assuming the door glass needs to come out in order to finish removing the wing assy. Correct? Also I'm assuming the window felts can't be removed with the glass still in the door. Also, am I going to regret taking this stuff apart?