It occurs to me that since I am not a tech, in any way, the safest way to work on amps containing hundreds of volts is to have disclaimers at the start of each video. I'll research various different disclaimers and come up with my own. I need to add that I'm not a technician and don't have a degree or any credentials as a technician.
It also makes me wonder if I should have commercials on my channel. Maybe once you put commercials on it, it doesn't matter if you put disclaimers on the videos. Maybe the courts consider you a professional just because you are making money on it.