Look at stored channel settings. For instance once you’ve dialed in guitar one of the band you could store that setting and use it as a template for dialing guitar two. Using the preamp option or not is personal preference together with an educated guess about the similarities between those 2 guitars regarding used volume etc. I never use it.
In your usercase you don’t need much of this as you have all the time to dial in the particulars of that one band the mixer is used for. Store the scene and you’re good to go next time around.
The most important thing is to learn/remember how to dial in any given source in the ballpark and go from there. One shouldn’t need the library except for f.i. customized fx-settings (that you can store).
Good luck !
Giga
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