There's a weird relationship between electricity and self-confidence that I've never quite understood; suspect it's similar to the phenomena that enables math to be the only general academic subject in which it is socially acceptable to suck at, and/or related to a lack of "correction window" when tinkering with forces that propagate at the speed of light.
That being said, I'd posit that having a set of technical manuals at your disposal would dramatically change this perception to the detriment of certain lucrative service markets. Everything breaks; the real question is who has the capacity to administer repairs, and at what cost?
It's really easy to kill yourself if you go messing around in your house wiring. It's possible to be safe, but it's not on the same plane as messing with an unplugged washing machine or TV.
Barring fires it isn't that hard. Just turn off the circuit breakers for absolutely everything in the area and test the voltages just in case there is any capicitance before touching any wires. I am a complete neophyte with wiring but that part is simple.
Of course, this has always been the case, people just accepted (or didn't understand) the risks. The capacitors in an old TV could pack quite a charge. Working on a roof has its risks. Early chemistry kits let kids blow stuff up. Apparently it was accepted more, before.