[JKCalhoun]

I can only add that I've been doing my own electrical work for over a decade now and have been successful.

Haven't been zapped either (I'm extremely careful about that, not so much when I was young).

To be sure though I have stopped at the point where a new circuit/breaker would need to be added to the panel, new wiring run. Although I do understand in theory how it is done, how to select the right gauge wire for the circuit, staying within the current limits of the panel....