We have a wonderful groomer that comes to our vet's office twice a week from Houston. We are more than welcome to leave Tatum all day if we have to work but usually we drop her off before 8 am and pick her up around lunch. The groomer gets to her pretty quickly though and then the ladies that work there play with her a bunch too. I trust my vet and all his associates so much though that I don't worry at all. This lady has been our groomer for probably about 10 years - she groomed our poodle also.
I think the scary part is when you take your dog to a chain store type place where someone different is always around. That would be a little scary to me. I'm used to small-town things though!