Replacing the backup lights switch on a 2002 ALH Volkswagen Jetta TDi (and likely other VWs)

A DYI guide to replacing the backup lights switch on a 2002 ALH Jetta TDi.
Time required: 30mn
Tools required: 10mm bit, 13mm bit, philips screwdriver, extension rod, thread locker blue (optional), WD40 (if needed), adjustable wrench.