The company I started with as an apprentice had a policy of “ do not touch” anything live for at least your first year in the trade. And depending upon what experience you gained during that time, it could be longer. I can’t remember when I started terminating wires on breakers that were off, but in a live panel.
There are bad habits that people do that need to be corrected early. For instance, using two hands on a screwdriver, one on the grip, and one on the shank, while terminating a wire.
I was taught to observe the work to be done, and the surrounding area of that location for potential hazards, like other trades also working nearby, trip hazards, etc.
“ Measure twice, cut once.”