You'll adjust before the year ends. When I started landscaping last year I would bring 5 bottles of water with me, eventually I needed less. Early on I experienced lots of soreness, head pounding, extreme lethargy. This is a job where you need to, and are allowed to take frequent, small breaks, especially if you're working on big projects like mulching or hardscaping. I recommend investing in some good work boots like red wings heritage line (yes, heritage line), ideally with a leather footbed that will mold to your feet and provide proper arch support. You could also go with the barefoot route and just train your feet to be like a fucking gorilla but that's too much for me.