When even I move into new house (new to me) I go through the main breaker box and go through the attic looking at the wiring for any defects or rewire jobs by previous owners. I systematically go through each labeled breaker by turning off each breaker and see were the power is cut in the house or outside. If I find difference I re-label. That way when in emergency I know what breaker powers what. BUT, I still test it with multi-meter before I open up any circuits. Reason I do this some switches that control one light from opposite sides may still have power feeding in depending on how it was wired. Only sure way to know if power is removed is using multi-meter or throwing the main breaker IMO.
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