I know you say you don't want to turn off the breakers, but that really is the best way. The method I use in a new house is:
(1)draw a simple floor plan noting each fixture.
(2)turn off all breakers.
(3)turn on one breaker at a time.
(4)use a circuit tester or night light and test each fixture.
(5)mark the floor plan map with the circuit when each fixture is on.
(6)return to #2
It can take a while but only once.
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