Had needles and electronic current used to detect nerve damage in my arms and legs and there was no discomfort but I don't have a problem with needles. I don't watch them stick me tho either. A trick I learned long ago for needles is to clench the opposite arm and relax the arm they are sticking you. It was trickier with the legs but curling the toes of the opposite leg worked. I have nerve damage in both arms and one leg due to spinal disk problems.