There are times busier than others or days. I would say the best time to go would be when they first open up(for example,if it's 9:00am, be there at 9:00am or several minutes after). It's also to your advantage as the providers are fresh; Hygeine,mentally, and physically. The busiest times would be the weekend(friday, saturday, and sunday)or weekdays in the afternoon or evenings. As for a appointment, yes you can make a appointment for your favorite provider(but make sure she is working on that day)or one you like to see, but make the appointment at a time that is slow.