Adding window to exterior door.

Hey, I want to add some light to my hallway and I saw a window that fits into a six panel door. Any tips or experience on how to cut the hole in the metal door and put the windor in nicely? Can't afford to make a mistake, my neighbours are nice, but I need a door. Thanks.

Follow the installation directions that come with the window.

Be sure you understand them B 4 you begin cutting the door.