Some of them just become muscle memory or other times there's really only one or two things that need to be remembered. I occasionally can never remember what voice or purple/blue is in/out for Cutter's Cry.

Sometimes it is hard to just list mechanics though but when/if it comes up I usually say something like "X Y Z are the mechanics. Don't remember if I missed any?" and someone else in the party will chime in. I have never had issues with someone saying they're new or forgot something. It's always when people not mention something and then things fall apart that it becomes "a thing."