If I had ever been here before I would probably know just what to do, don't you

Packing to go on a week-long horse roundup in Idaho, plane leaving in, oh, about 10 hours. I'm not worried about the riding, I'm not worried about being off the grid for that long, I'm not even worried about whether I have enough shampoo or micro-SD cards. It's just... I don't... I've never been to Idaho before, and what if it sucks?

ETA: I can pack for Stockholm in half an hour max, even if I'm staying an extra couple days to do a race. So it's definitely a slightly-outside-my-comfort-zone anxiety.