Originally Posted by TheOtherDave™
And yes, to avoid the possbility of electrical shock, disconnect the negative terminal of the battery whenever you're working on the car's electrical system.
I doubt there are any risk of a lethal electrical shock from the car battery or from a standard Honda ignition coil. It's simpler to turn off the ignition.
But if you're working near the ignition switch then it's a good idea to disconnect the negative battery since you could burn yourself or blow the fuses if your screw driver shorted the exposed ignition terminals.