Pins are anon issue, though ironically, they were for me. They numb you and put the head frame on like a racing car pitstop. 5 minutes and you may be completely out, but definitely won't feel it. For me, one pin was close to a blood vessel so the anesthesia wore off fast and by the time I was in the machine, it hurt like hell, but that is so rare it's not something to consider. The pin sites may be sore or numb for days or weeks, but not a big deal. Infection is a non issue. Very rare, and superficial if it occurs.