Haha, if it soothes your further one of my coworkers was nearly microchipped. The gal chipping pushed right through the other side of the skin on a cat and stabbed her in the hand. She said for how big the needle was she didn't really feel any thing!
The first few times I did it it made my skin crawl but after a while of a vast majority of dogs/cats not reacting it got easier. To get AAHA certified I had to do my VERY first one in front of a vet to sign off and I gagged when I put the needle in.