Good tutorial but there is absolutely no need to remove the door card.
Not being funny but no there isn't. Changed the handles to chrome ones on both my Corsas and never removed a door card once. Fitted them in about ten minutes with no problems whatsoever. Thats not a dig, it just doesn't need to be done from experience.Yes there is. You can't properly get behind the door handle base with the door card on. It's much easier to do this job without the door card on and it only takes 2 seconds to remove it anyway.