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It's subjective, the more you do, the more weight you add.
You can add just a little at key points, or you can cover every visible piece of sheet metal and then some. The more you add the more potential you have for a very dead door. At what point you want to stop is up to you. I'd say consider three sections if you want to be really thorough but not obsessed.
The door structure has two skins, outer and inner. Cover the outer as thoroughly as you wish, at least covering the large flat areas. The inner skin will have large openings. Cover as much of this as you wish as well, going a step further you can use pieces of aluminum or perforated sheet metal to act as covers for the openings and cover them with deadener as well to create a more solid "enclosure". Then do the backside of the door card/interior skin, again, as much as you wish.
Adding a second layer isn't completely necessary, but can help. I'd say at least add a second layer in the center of larger flat areas.
and add a closed cell pad or speaker anti-reflection pad right behind the speaker to the outer skin.
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