That's the only breaker box on the property? It seems more like a sub panel that would be turned off from a breaker on the main panel.
What country are you in?
I've done lot's of work in live panels, and I'd like to add one thing to the advice you've been given. Keep in mind that electricty needs to have a route to ground or elsewhere to complete the circuit, which means while you are working on it make sure your other hand (or any body part) isn't touching anything that could complete the circuit, such as the metal of the breaker box. If your hand on the screwdriver slips and touches something live, the electricity would go through one arm and out the other to complete the circuit - which means right through your chest and vital organs...
I had a family member who was a lineman working on a power pole that was supposed to have no power. His knee touched one piece of metal and a wrench on his tool belt touched another and most of the tissue between those points was cooked. Graphic I know, but I just want to be sure you take the danger seriously.
What country are you in?
I've done lot's of work in live panels, and I'd like to add one thing to the advice you've been given. Keep in mind that electricty needs to have a route to ground or elsewhere to complete the circuit, which means while you are working on it make sure your other hand (or any body part) isn't touching anything that could complete the circuit, such as the metal of the breaker box. If your hand on the screwdriver slips and touches something live, the electricity would go through one arm and out the other to complete the circuit - which means right through your chest and vital organs...
I had a family member who was a lineman working on a power pole that was supposed to have no power. His knee touched one piece of metal and a wrench on his tool belt touched another and most of the tissue between those points was cooked. Graphic I know, but I just want to be sure you take the danger seriously.