It's second nature to me to be afraid, but not terrified of electricity. I'm not an electrician but I've dropped in new breakers and pulled lines, calculated the max load on the circuit, and put in panel-mounted GFCIs (My favorite, because, as you saw, they protect EVERYTHING from the box out). My basement had very few outlets when I moved in so during a remodel of the kitchen upstairs, had the electrician put 20amp GFCI 4-gang outlets all over the basement--at least 5 of them to run all my tools safely.