Another 65 Cuda glass question.

Now that I have my vent windows and quarter windows in, today was supposed to be the day to put in the door glass. Anyone got some tips on doing this? So far I've tried to get the window in with the reg still bolted into the door and that hasn't worked to well. Then I tried taking the track off the window, putting it in the tab on the reg but that didn't work because I couldn't get the window in the right place to put the track back on the window. My next step will be to take the reg out of the door and install the glass on it and drop it in as a unit but there has to be an easier way,,,isn't there???