Wow, "Service work must be proceeded by Battery disconnect / decommission...taking up to an hour".
That is starting to edge into legal territory.
I can now imagine a new California LAW, prohibiting any'tinkering', or Saturday afternoon repairs / upgrades, unless QUALIFIED AND CERTIFIED automotive technician involved.
That's because you want your procedures and labor to be safe, not in the hands of, (gasp), some random fool, with a wrench.