I finally worked up the nerve to try it last friday using needles like the ones used to draw blood. The first two went in as previously descibed. Stinging sensation as the needle went through the scrotum skin and then just a pressure sensation as the needle entered the testicles. The needles were not long enough to pass completely through to the other side. I had a rush from the thrill of doing something so radical. The third needle however was different. The needle started like the other ones but about half way through it must have hit a nerve and the pain was just like someone had kicked my in the nuts. I tried to push the needle past that point but the pain was too much and I had to pull the needle out. My ball ached for two days and even today if I sit wrong it hurts. I don't know if I will do it again, too much risk of infection.
The other thing that causes pain is my testicles moved around in my sack causing the needles to wiggle and move with the movement of my balls.