I have five and for me it was the inside wrist that hurt the most.
Top of my foot was my first one and I honestly didnt think it was that bad.
My stamp tramp is the biggest and that hurt too but I htink it was cause it took the longest.
Small one on the back of my neck didnt hurt at all
and the one on the side of my other foot really hurt too. I think it is a toss up actually between that one and the wrist as been the sorest.

I was just saying to DH yesterday that I really like "sleeves" and I think when we are rich he should start adding to his arm one to make it into a sleeve.