I recently got my skates (U+ 09) baked and molded using the FIT system. For me, it didn't hurt at all. This is the procedure I followed (per instructed by the nice folks at No Icing Sports): Put skates on after they come out of the oven Tighten skates a little looser than if you were to skate with them Leave the top eyelet open Stick your feet into the FIT machine and they turn the machine on, the air bladders inflate, I felt moderate pressure around my foot, but nothing painful For approximately the next 15 minutes or so, the machine continues to add air every 3-5 minutes, I think it's to keep the pressure consistent, not to add more pressure After about 15 minutes, the air relieved, the store was busy, so it was another 5-10 minutes before I got my feet out of the machine I was really surprised how much the skates molded to my feet.