How difficult is it to work as a cashier or bagger at Stop & Shop?how often you can use the bathroom?

I’ve mostly worked outside collecting carts, but now they’re starting to schedule me for some cashier and bagger hours.
How difficult is it to be a cashier at Stop & Shop? Do they give you enough training before you’re on your own?
Also, how does it work if you need to use the bathroom while you’re on register? Do you just tell the front-end manager or supervisor so someone can cover your register?
What about being a bagger/cashier assistant? Is that pretty easy compared to being on register?
And roughly how many regular cashiers are usually working at the same time nowadays? It seems like self-checkout has taken over and there are fewer regular registers open than there used to be.
Just curious what the typical experience is like at Stop & Shop or similar supermarkets.