From 00:11

Measure and record the inner frame of the door.

From 00:30

Measure and mark container for cutting

From 00:39

Mark cutting guides with painters tape for a nice visible cutting line.

From 00:58

Proceed with cutting the door hole with your tools and safety gear of choice.

From 01:13

Safely remove the panel that was cut out for the door.

From 01:28

With the tool of your choice smooth the bottom into a flat surface and clean up the sides of any burs.

From 01:44

Carefully place door in cut out.

From 02:02

Door can be held in place by using one self-taping screw on each side of the outer frame approximately half way up the door height

From 02:10

Ensure your door is straight and has an even gap around the door to the frame. Adjust if it is not

From 03:00

During this process make sure you are checking the gap around the door regularly to ensure you have a proper fit.