We estimate the installation time at less than one hour:
Adjust the height of your door unit to the height of your recess.
Keep only the framework of the door unit, setting all the other elements aside.
Insert your door unit in your recess and adjust the level of the door unit using various wedges. Screw the door unit to your partition. Install your door and check that it is level. If this is not the case, adjust your wedges.
Install the elements masking the screws. (a top element and two side elements).
Glue the removable rebates using a glue gun. Adjust them to the thickness of your partition.