For one automation you use or plan, write the stop procedure: exact steps to halt it in under a minute. Test it if safe. You're done when the steps are written and you'd bet a coffee they work.
How-to · AUT · AUT.2
Find the kill switch first
Before relying on any automation, know exactly how to stop it in under a minute — pause, revoke, or unplug.
Worked example
The time to find the kill switch is before the automation misfires, not during. Pause button, revoked credential, disabled trigger — whatever form it takes, you should be able to stop the thing in under sixty seconds without googling.