I would never let anyone work on my car without my supervision
I like being a PITA when it comes to my car. However, the owner Atif is a decent guy and has experience with good products(meguiars,3M). Give him a call, ask him whether he will be working on your vehicle or would he conveniently hand it over to one of the workers...
In parallel, look up online what each step of detailing is used for so you can choose the right package(wash, clay, compound, polish, sealant etc)