I got my eyebrows threaded here and found it incredibly stressful. The technician was not very sensitive to my apprehension about her suggestions, though it was my first time here. She got annoyed and stressed when I repeated my preferences, but would also repeat her suggestions as to what to do with my eyebrows.
I would say if you’re nervous or particular, you should be confident and clear with what you want when coming here or you might be effectively bullied into a different approach.