Mount the hinges to the door using the predrilled holes. Line the top of the door up with the top of the cabinet box and screw in one screw per hinge (for now), starting with the top hinge. Leave a 1/8 gap between the side edge of the door and the cabinet box. Once all of your doors are installed, adjust the hinges so all of the gaps are even and the doors are lined up. Once you are happy with the alignment of the doors, proceed to install the final screw on all the hinges.