What I thought would be a few hours of paperwork and formalities turned out to be my actual, official first day on the job. My feet are sore and my pits are sweaty, but my heart is full.
Today was all about familiarizing myself with the store (which entailed a three-hour-long scavenger hunt in which I had to track down the exact location of the store's 100 most popular items - apparently landlines are still a thing, and we sell them), then getting the basics of the cash register (which I had to learn FAST, because I got put on the register right as a massive wave of people came in seeking to get their shopping done before a bad storm hit). But I got to help a lot of people, and my coworkers are very patient, and only one customer got huffy with me for not being fast enough, and I learned a whole bunch of things today, and it was just overall a good day!
I've finally got a job. This is like a dream come true.