They can't tell me how many treatments I will need. I never shaved prior to having the treatment (just plucked to thin) but it had gotten to the point where I couldn't take it anymore so they shaved it off on when I went in the first time. Now I shave it between treatments but usually leave a day or two so they can get an idea of the spots which need treatment. I can understand why you can't pluck or wax for 6 weeks but don't see any reason you couldn't shave as long as you leave it enough for them to see.
After I went in they gave me some emla cream and told me to come back in about an hour because she was afraid that my moustache area would be very painful without it. (very dark and course hair)
There is one spot on my upper lip which already seems smooth and hairfree but the technician can't say whether we have gotten all the hair in that area yet or not.
My sideburn area is mostly blond right now and I think it will probably require more treatments as the blondes become dark whereas my moustache is already mostly dark. I am optimistic about the treatments but realize it may be quite costly and time consuming (I did find a pretty good deal though by traveling to Canada for the work)

Sheri