Modern (and even semi-modern) studfinders have wiring detection functionality built in. It's pretty easy to get a read off live cables from that distance.
It's a bathroom wall I was studying. I can actually predict electric wiring quite well, but yeah, it has that functionality as well, as cheap as it was. I'm a bit more worried about water pipes. But mostly I'm worried about the drywall breaking...
But mostly I'm worried about the drywall breaking...
Sharp drill, go slow, high quality screws, and if you're really worried about it, use some of that blue painter's tape before you drill, then take it off after you're done (who cares if little bits of tape went into the wall with the screws).