Yeah I definitely get the pysching ourselves up too much, like the AV knows where to needle "Hey vaca is different, it's not everyday, yeah yeah you got the everyday thing, but looook this is different" Boogey man scare tactics.
The only thing I had to do once on a trip was decide how cranky I was going to let myself be. Turned out I didn't have to be much different, drinking at home is off the table as an option , not because I am home, its off the table always, I just happen to be at home. You got this, just work on trying not to be too cranky, and hopefully that shouldnt really be a big concern. Enjoy yourself , its Vaca
