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)
Not really, changing out the battery takes 2 hours because you need to take out everything else first and it's anything but foolproof.
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)