There is regulation, like mandatory yearly inspections and anyone is only allowed to sell road worthy vehicles. These rules are rather strict, likewise for the driver's license. They aren't impossible to know or understand, but there's a lot of details.
However, when I take it to the shop, whether for that yearly inspection, regular maintenance, or because there's something apparently wrong with it, I never know what to expect in terms of time and money.
Oh, it needs a new thingamajig? I start to mildly sweat, fearing it to cost six hundred like the flux capacitor that had to be replaced last week/month/year and took two weeks to get shipped from another country. "Ninety cents, and we put it in place for no charge, it literally takes ten seconds", like, I love to hear the news, could have saved me from the anguish by giving a hint when I asked about the price! But need a new key? Starting from three hundred fifty, plus one hundred seventy for a backup copy. Like, where do these prices come from? Actually, don't tell me, I'm a software engineer. I know, I know.
I'll just wait until you want your car shop web pages up. Oh, for that you'll need PCI DSS and we can't do that other things because of GDPR. Sorry, my hands are tied here. That'll be four thousand plus tax, mister auto mechanic shop owner.