While I agree people can be taught to work on their home in a safe manner without calling a professional, it’s dangerous to say that getting shocked is essentially not dangerous (at worst they get a very minor shock). You don’t have to have a heart condition for this to seriously hurt or kill you. Of course, most people that get shocked don’t get seriously injured, otherwise I’d have a lot more electrical injuries in the ER, but that doesn’t mean you shouldn’t treat residential electrical as something that can kill you.