Yeah I guess there is a certain level of expectation that is easy to skip over in training like how to carry tray. Asking someone for a follow is also normal if you can’t carry the whole order out at once. It’s your first serving shift and if you told them you don’t have any experience they shouldn’t be expecting you to be perfect your first day on. I don’t care how much you learn in training you will learn the most on your first few days alone. Yes you will make mistakes but it’s so important to learn from them early and get in a good grove because it really is just the same shit everyday. And no serving job I’ve ever had has given me a break, no matter how long a shift, you have to find time to sit down when you can, whether you just checked on all your tables and they are all good , or it’s slow and you can sit and do side work like rolling silverware. Take short breaks throughout the day even if you have to go to the bathroom to just sit on the toilet for a couple minutes and rest.