I think this topic might have been covered reasonably recently, but here goes anyway.
I use a decent razor and antiseptic handwash for bubbles (mainly because it's slicker than soap or shaving foam/gel), after (and here's the slightly uncomfortable part) dipping them into a mug of cold water to tighten up the skin. It takes a little practice, but seems to be the best way I can find.
Don't whatever you do try to use a set of electric hair clippers, I did once and caught myself two or three times, I was dripping blood all over the bathroom. :cry: