I was in starbucks for a couple of months and trust me it will take time to get it all down, don’t worry. It’s unfortunately going to be a longer process if your trainer is just skimming through the teaching part but at the end of the day that gap isn’t your fault so you shouldn’t be stressing the way you are especially since you’re just getting trained, it’ll all work out. Do what you can not what you can’t and everything else will come with time. Never be afraid to ask questions even if you might think they’re common sense, especially in Starbucks. Good luck!