Of course it’s plenty under the right conditions but it’s very easy to use insulated tools or gloves and not be at any risk of shock. Or you can work with the power shut off at the transformer or get the meter pulled. On the other hand you might not know you’ve created a situation that will burn down your house until way later and it’s too late. I’ve touched a 120v leg on a 200a bus by accident and barely felt a tingle in that situation. The expertise is not in trying to not be shocked because that’s the obvious risk. The less obvious risk is dying in a house fire because of an arcing connection somewhere that doesn’t cause a breaker or fuse to trip.