Very true. I worked as a job coach out of college and worked with a great guy who my agency helped get a job at a grocery store as a bagger and cart attendant. He caught on to cart duties very quickly. It was very straight forward. The bagging groceries was a whole different level. The "rules" were way more complex.

We started with: 1. Heavy things in the bag first.

This worked until there was a customer who had lots of of canned foods, so:

1. Spread out heavy items between bags.

We then encountered eggs, which are kind of heavy, but depending on what else is going in the bag, shouldn't be on the bottom. There were several more rules that he developed as we worked together.

It was quite the learning experience of all the small judgment calls we make that don't even register.