it's a cycle well known in lower end jobs
1. one dude goes through hell on his first days
2. he starts to improve, excels and then is appointed to train others
3. he makes sure that newcomers suffers as much or worse than him
the best thing you can do in this scenario is ASK.. ask A LOT. it is ok to not know what to do, as long as you show yourself interested in learning and finding the solution for the things.. once you get past this, you'll most likely find someone that will take you under their wing and teach you properly.
there are usually 2 ways of completing a task in such environment - the way they teach you and the way the older employees do it. once you learn the latter one you should be fine.
remember: one way to make your shitty job feel better is to pretend that nobody else can do it, so a lot of people will try to create obstacles to bring you down and make you feel like you can't do it. don't let those accomodated cucks win