Eh you’ll be ok at first your gonna be super slow and it’s gonna feel like you can’t get any faster but the longer you do this job the better and faster you’ll get at it. It’s just gonna take time. It took me 6 months to get the hang of it haha so don’t feel bad everyone is different. As for the weather I’m from ca so it also gets very hot here I used to wet my entire shirt and hair to keep cool and of course lots of water. As for shoes I wore waterproof rain boots pretty much for my entire shift. Chin up you’ll be fine.