For the record, you don't have to take "everything else" out first. It's actually quite accessible once removing the Steam Deck back plate, which is easily done with a Phillips head screwdriver. The bulk of the 2-4 hour estimate on iFixit is dealing with the battery adhesive. (source: I've opened my Steam Deck to swap the SSD, and I just opened it to attempt a band-aid fix to the right bumper after dropping the Deck directly on it while waiting for the part to restock)