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I would be cautious about using a new mixer out of the box for an important service without someone there to provide support.

Its a different situation for a walkup at a concert because there is usally a system engineer to step in and fix any issues on the fly, but in your case you are on your own.

If you decide to go ahead, all you have to really watch out for is making sure that you have the right mix button selected when you change a level. It still occasionally catches me out to be mixing an aux when I thought I was mixing FOH.