DUDE the "finally yelled at me" part hits so hard. I had a print shop lady straight up grab my file and say "you're doing this all wrong" and showed me the proper way to set up bleeds and margins. Felt like such an idiot but honestly it saved me so much time and money after that.
People who work at print shops are unsung heroes honestly. That lady probably saved you from throwing away money on a whole batch of messed up prints. It stings in the moment but that kind of tough love is pure gold in the long run.