Ive done a full shell swap it was tedious and took me like 6 hours being careful the screen is definitely one of the hardest parts followed by the trackpads. An ifixit kit comes in handy but you must take your time with it and use heat. You may just want to consider getting a screen upgrade and dropping that in cause everything goes back together wayyy easier
Should just be able to disconnect the screen and leave it attached to the front part of the shell. If i recall correctly