Man, I totally used to be in that camp thinking certs were just fancy paper. Almost learned the hard way when I tried to help a buddy with his Prius and nearly gave myself a new hairstyle with the high voltage system. That was a real wake up call. Now I get why shops have those insurance rules, it's not just red tape. That little scare made me sign up for a course the next week, no joke. Turns out knowing what you're doing around a battery pack that can stop your heart is pretty good for job security.