Advice.... if you are doing manual labour or lifting of things definitely learn how to lift properly (although "lift with your knees" is the short version there is a tiny bit more to it than that), try to keep warmed up, definitely keep fluids in you and do nothing risky to your back whatsoever- if something risks your back you are doing it wrong. The second would be do nothing risky to your hands but that is general life advice in the modern world... the amount of people I see riding motorbikes without proper gloves or indeed any at all.
Yeah, I stack about 700 planks of wood a day. Back is no problem, I've learned to throw properly within a couple hours. But my left hand is hurting, I doubt its carpal tunnel from 2 days work, it's probably just hurting because I havent used those types of muscles before.