I would recommend keeping multiple pieces of double-sided tape for each step that requires removing screws. Also perhaps label them, or take notes, so you know which piece of tape (and the screws attached to it) go with which step number. It's easy to confuse screws, especially if you go past these instructions to remove everything required to replace the ribbon cable that is necessary for the buttons.
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I would recommend keeping multiple pieces of double-sided tape for each step that requires removing screws. Also perhaps label them, or take notes, so you know which piece of tape (and the screws attached to it) go with which step number. It's easy to confuse screws, especially if you go past these instructions to remove everything required to replace the ribbon cable that is necessary for the buttons.