How cani open the midgate door on my gmc envoy xuv with the window Regulator out

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The window regulator or motor is out and the window is in the down position not allowing me to swing the midgate door open to be replace bymyself can this repair be done with the door in the closed position from the inside of the tailbed of the vehicle or is there a way to manually get the midgate door open to make the repair more easyer!! Please help if you have any suggestions