I got a set fitted at CostCo coventry. You can watch quite easily but due to insurance you are not allowed up close. Effectively they drive the car into the bay, but they only have to drive it about 10 foot. So you are only about 5 foot from the rear of your vehicle. The Tyre removal, replacement and balancing all occurs at the front of the car effectively so you can watch everything they do but you have to stand behind a red tape which goes across the garage door. I am sure if you asked nicely they may allow you to check jacking points etc. As far as I remember they just used used jacks and did not put it on a ramp.
They did a good job, had plastic sleave on the wheel nut socket to protect the alloys. Used the proper alloy weights etc.
So I was satisfied and they did a very reasonable job. The chaps do seem to be a bit more trained and experienced than your average tyre fitting team.
I also worry about the alloys being damaged so I did keep a close eye on them.
I am going to buy an other set of Winter Tyres there under the 20% off offer starting this week, will get these fitted as soon as it gets below 7 Celcius in the mornings - generally October time. But thats what is great, you can buy the tyres take them home and then get them fitted an other time.