[k__]

If you hire someone to do stufd you are bad at, you often end up in being unable to tell if they do it well

[goatherders]

That's ridiculous. People hire accountants, lawyers, and doctors all the time.

[millzlane]

I see op's logic. How would you know when or if they did a poor job? Would it be after your audit, your guilty verdict, or the malpractice claim?

[k__]

Just look at marketing and sales. It's basically a lottery...

[narag]

For any task you should be able to find information to teach yourself at least basic monitoring. If you can't get good at doing it, you can at least be reasonably good to judge if it's working.

[_vn5r]

Maybe can be changed to "Use your network to find..."

Hopefully referrals are a bit better than lottery

[RandomBK]

Accountants, lawyers, and doctors all have associations who set professional standards they must abide by. They often also owe you a higher duty of care than someone in i.e. marketing or sales.

I still see where op is going, but accountants, lawyers, and doctors aren't the greatest counterexamples to use here.

[staticautomatic]

Sure they are. There's plenty of variation in quality among people in those respective fields, just like every professional field.