So much this.
I know of a case where a company hired a junior java dev for a desktop project and after his second week on the job the manager posted a ticket instructing the newbie to implement a component to receive a video stream from a drone, stitch the video stream into a 3D model, and render the 3D model in real time. "How many days do you need to finish this?"
* Not knowing the difference between ignorance and knowledge.
Most probably both at the same time.
Like the Dunning-Kruger Effect?
In such a position I would slightly prefer to say “I should have hired an expert” and not “I was not keen enough to know that the person I hired was not actually an expert”
Sometimes, we misjudge that risk or get unlucky.