Just wanted to post in agreement with what Arlene just said.
I regularly see an experienced threader in my area. There are several in the salon. There are areas they consider "customary" for threading--generally small facial areas--brows, chin, upper lip, even the hair line (where sideburns grow), possibly part of the neck.
I've seen a couple of people ask for threading of larger areas, and they were told that the area must be waxed. I once overheard someone asking if the bikini area could be threaded (Yowch!) lol. They were told they had to be waxed as well.
