I heard it said someone recently that if you're mixing like an octopus you're doing it wrong. I wish I could remember who that was so I could give them credit for it. Sure it happens once in a while that you really have to scramble to get a mix together but really... if you're a pro shouldn't you have your stuff together and be able to just chill and mix your show?
It's easy to picture, the difference between some junior high kid struggling to keep three mics in check and a guy mixing forty-eight or more channels in an arena. The only difference is the prep work. Obviously the guy out on tour has been prepping for gigs for a while longer than the kid but you get the point.
I feel like if every time you step up to mix you're scrambling here, there and everywhere then you're either woefully unprepared or you're showing off and you should correct for that whichever the case. There's not really any specific tips or lesson in this one. Just this one simple thing.