I dont see why you would need a license, the other day i went to go get my flat fixed (i dont waste my time when i can waste 2$ for labour on somthing i could seriously screw up on my rear derailur) the kid who was about 15 put my tire on wrong, and loose to, i fixed it, but make sure you dont screw up cause it will haunt you for a while if its a big thing, i know this and im 12.... lol