With how easy it seems to be to do serious damage with the next few steps, I figured I'd say that realistically you can skip steps 9-13 when doing this repair. While they provide a bit of extra security by disconnecting the battery, the left stick is completely accessible and replaceable without touching the heat shield or anything underneath (And steps 17 and 18 disconnect power from the daughter board regardless).

With how easy it seems to be to do serious damage at this point, I figured I'd say that realistically you can skip steps 9-13 when doing this repair. While they provide a bit of extra security by disconnecting the battery, the left stick is completely accessible and replaceable without touching the heat shield or anything underneath (And steps 17 and 18 disconnect power from the daughter board regardless).