That's such sound advice, though I can already see the little smirk on their faces as I ask said questions or look around if I were to do that locally! I suppose it'd take a while to suss out one who 'gets it'. I know I did this at the tyre shop I go to here, did along the lines of what you said and mentioned things like wanting the alloys not damaged and they did "get it". Had a few trouble free experiences there but last year, unknown to me, totally new crew and manager. I had such a good track record with them thought nothing of it. Had the car back a few times, shaky seat from balancing etc. Back again for alignment.. not great. Company head office (got a few across NI but not mainland big) said they did change the team there and had a lot of complaints and assured me they'd all been let go and to please try them again... and back to regular service. But it just shows how likely it can be that even a 'good place' can turn sour fast.You do have to be very careful about who you entrust your vehicle to, but this is not a new situation - ever has it been thus. There are a lot of so called mechanics who have done some very basic qualification, or none at all, and just picked "stuff" up as they've gone along. Depending on who they've been working with this may be good, but often not so good and poor working practices are learnt.
The big problem of course, and this is so difficult for someone with no or little mechanical experience, is how to find the guys - and/or girls - who do know what they are on about. Although not completely infallible, seeking out an organization/workshop which professes to be a specialist in your make of car. Call in and question them, politely, on their claim. A lot of these type of workshop are likely to be small maybe family owned affairs so ask if it's just the owner who has the experience or do they specifically employ manufacturer qualified employees. Our two trusted local Audi independents seem to pay more than the main dealer and "poach" their skilled technical staff from them! Take a good look at the workshop, is it reasonably neat and clean or is there stuff lying all over the place with a filthy floor - it's not going to look like your doctor's surgery but if it's filthy and the equipment, jacks, axle stands, and defective parts etc are just strewn around and the floor is filthy then I'd be wary. What's the welcome like - I like someone I can easily communicate with. Also word of mouth recommendations from friends and work colleagues can be very useful.
I cut ties with my Toyota dealer recently for them missing the chunk out of my caliper, that and the fact they keep the shutter down over the workshop window to the waiting room... something meant to be a Toyota policy, but seems like it was in the past. Ironically, it was our old Fiat dealer across the way (now closed) who used a former Toyota showroom with the window, who made me aware of that. Multiple mentions / requests and even message to Toyota and it turns out it's up to them if they want to open it. But they don't..
Word of mouth probably is the best idea in reality, though back in 2015 when I stupidly bought a really bad Corsa, I must have wasted nearly a grand between taking it to everybody's 'recommendation' locally. They all had nothing but positive things to say about each of the mechanics saying they're fairly priced.. honest... and whatnot but it turned out really they just weren't car people, weren't into checking anything and victim to the same old tricks they play. They also didn't have brand new or old bangers, so chances are most of the time they never had major repair bills or anything either to get them really sniffing around. Though I learnt a LOT in the years to follow from that poor basis!
Still always saddens me, as last month I did my brakes and was able to find a nearby dealer (across the border) who did know and care to discuss and suggest the greases / parts - the only one who knew the part codes between 'economy' genuine parts and 'factory' genuine parts, the latter of which should be the only parts sold for a CT200.. whereas others didn't know or care to advise. I did this now and that was fine, but someday in the future, if I'm for some reason unable to do the work myself - I'd be screwed. Go to a dealer, pay over the odds, still not get a good proper job done... or go to some local mechanic and pay for a sub-par job. Even my uncle who always helps now and does his own work, still does it but with age, starting to not want to spend much time at all dealing with these issues. The motor trade is crap, but then again... look around, the tech industry, and many other industries I've a bit of knowledge in aren't really much better!