It’s the hardest job in the world. There’s no interview to see if you have the right skills for it, no fail-proof training to give them to you if you don’t. The original product is something you’ve never dealt with before and it arrives with dozens of accessories but no instruction manual.

In the early days, it emits all sorts of alarms, all of which relate to different operational issues but which, to your spectacularly untrained ear, sound exactly the same.

Through trial and error, you learn how to fix these problems. But no sooner do you resolve one than another, completely new problem arises for you to work out. And pretty soon you’re wondering if you’re worthy or capable of doing the job at all.

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