Nope, no appointment necessary, but I would still call to make sure that they are all there that day. I don't know if everyone there does the fittings. I did try the ultra lights, but they were a little too light for my liking, though I have heard of others who swear by them for pruning.
When I just had my Limmers resoled, I had Peter but on the most rugged Vibram sole lugs that they make and boy do they grip the trees awesome!