Most shops have unrealistic expectations of a newly hired tech. That problem, combined with the new tech wanting to make a good impression during the hiring/interviewing process opens up the possibility of misunderstanding and miscues. We were a transmission shop specialist. Transmission, transfer cases, clutches, and differentials only. No General Repair. Before I became a shop owner, I had more than one shop wanting me to be a "Mr. Know-It-All". This was in the early & mid-1970s when all technical information was only printed in huge service manuals with tiny illustrations and fonts that few shops had current issues. I remember an older gentleman coming around once or twice a year with a trunk full of manuals for sale. I quickly learned that if I wanted a transmission manual, I would have to buy it because the shop owner wouldn't. The excuse he used was, "Manuals have a way of growing legs." because that's been his experience. Technical information was hard to come by in those days.
Fast forward to today, everything is online, mostly by subscription. However, there are a lot of industry groups that cost little or nothing where you can both learn & share information & experiences. Our AutoShopOwner group is but one example. Today's technician should have an ample list of their online friends in the business. I can remember meeting several of my online friends for the first time in a face-to-face meeting at the Transmission Expo. It blew my mind because I had made up an image of what they would look and talk like in my mind. In reality, I wasn't even close.
What worked the best for me was taking the time to write a Technician's Job Description that I heard about in a seminar I attended. It sounds a lot easier than it is. I don't expect to hire a Walking Oracle, but I do expect the tech to find the information he needs online. I edited the Technician's Job Description numerous times as things came up. It took me at least 6 months to settle on the final contents.
We had a 90-day orientation period where both the shop and the new hire learned what to do, what was expected, and how to find information when you needed it. Within 90 days, both our shop and the new hire had a good feeling (or not) about things working out. Sadly, I finally settled on this winning formula later in my career, about 1995-2015. I hope this helps others in hiring a qualified Master Tech. As we all know, they are in very short supply.