Hiking this summer

My little boy (1/2) will be around 1 and a half this summer and would LOVE to get back in to hiking as I was just a bit too anxious last summer due to not knowing what to dress them in, worrying about changing them on the trail, etc. but I feel much more confident this summer and would love to know every ones tips! We have our hiking backpack already and I can't wait to use it properly but any tips on gear, changing nappies, food, even trails local to merseyside would be great! TIA