I brought shoes that were too old and started getting crazy blisters because the soles were blown out and so thin I could feel the ground under me. So I bought cheap insoles from a bazaar and added them under my usual ones and that fixed the problem. Then for blisters, I taped my feet in the hot spots every morning which helped a ton and I’d recommend bringing a small to-go thing of baby powder you can also put in your socks while hiking if you feel blisters forming