If it's of any consolation, they don't cut open the whole scrotum or anything. They make a pinhole (that's tiny!) incision, and reach for the vas deferens just enough to inject it with a syringe.

And I don't think it does anything to make you feel like your balls are "frail". So far the only side-effects I've read about are a possibility of swelling for 1 week after the operation. Then, you're back to your old non-frail-balls self!