+1 for the ladder-as-wire-reeler idea. Done it several times. Don't forget to throw a couple of fittings on the end of the conduit so it doesn't accidentally roll itself off the braces.
The line voltage circuit tracers ("Breaker finders") are great when you're trying to ID the D/C for the circuit you're working on. Don't forget, even if your detector is a little vague between 2 different breakers - the trace tone will disappear when you kill the right one!
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. (Don't ask)
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Also remember - C-clamps are your friends... especially when installing conduit horizontally by yourself. You can clamp to the joist / truss, and run the stick through the clamp... no more trying to line up a hanger 8' away, or up the ladder...down the ladder three times for one run.