Can skip from step 3 to step 36. This is what I did and it worked fine. The additional steps feel like a precaution, so that when acetone is used to free the battery adhesive, it doesn’t go everywhere. But if you’re careful, it’s possible to apply acetone and remove the battery without taking everything out of the machine, which has risks of its own, like the machine may not boot properly later.

Note that acetone will turn the black speaker housing white. Don’t ask how I know this.