May I add an extra gotcha?

Running lots of EQ on a channel stage can also boost a signal so that it overloads the mixer bus even if the input itself is fine. At this point your ability to spot this depends on (a) whether there is an input overload LED and (b) whereabouts in the channel the overload circuit is monitoring.

Generally I'm reminded of a live PA engineer I once worked with whose basic premise was "run all the amps at max so you can leave everything else low"