Like said above, where to get the mats, the Mountain only go during the day, make a small outpost near by with a bed, so if a wolf gets up. also make camp fires often, unless you have made Frost Resist potions. the obsidian is mainly on higher spots of the mountains well.

Swamp is a slow mover, like said above Hoe a path, helps a lot and I use a bow on Slime's and Leeches 2-3 arrows each and if you have the Key from the 2nd boss, open up all the crypts and put a camp fire inside each helps while moving. Cart and a small outpost outside the swamp is nice, I put up a Portal so I can repair and make break my boat down and store it in a chest till I sail.