It's was really simple and easy. You walk in the store (for me, Costco), ask the worker you're there for an interview and they'll tell you where the room is. When i went it was as busy as usual so i did have to wait at a bit but other than that, it was pretty chill.

It was way more easygoing than what I was anxious about. We walked around the store while the interviewer asked me how I found the job, what my background was, and explained what product demonstrators do and how they work, and if I was comfortable working under certain conditions (near the freezers, in the crowded store, etc.)