Two deathly dangers - one from actual electrical shock, one from
impaling yourself on something sharp when you jump from the shock and
bleed to death

A good reason to find another line of work. Just remember, a live circuit
looks exactly like a dead circuit. Also HV caps can hold a charge enough to
bang you too. If you learned on tube gear, then maybe you know enough, but
LV circuits just don't have the urgency required to heighten your paranoia
for survivability. You essentially have to develop a checklist in your head
for each time you put a hand (only one) into the dead equipment and never
fail. Instructions are normally in the Service Manual of all HV equipment.