Katmandu,
I meant in the mechanics of it. She said she has been getting it waxed for some time, so the pain won't be the problem.

As for your other question, no, I didn't use it on my balls. The problem there is that there has to be some skin tension, and I just don't see how you could get enough there. The other thing is that softer/more tender skin will rip up a little more easily, and there isn't so much hair that that an electric razor is too bad.

The diciest sections were right at the base of my penis, and as mentioned above, an erection was required to get the skin tight enough to not be diastrous.