Seriously. It wasn't that bad.
5-1 was the easiest stage in the game, and the boss only took two tries (fell off the platform while sniping him the first time), 5-2 was more tedious than difficult. After getting killed twice I realized to just avoid the big trolls, so the only problem was getting lost in that damn swamp while poisoned. The boss was one of the few I killed on the first try--just spammed magic at him from the door while chomping down grass.
And then Vinland was easy to melee, because the idiot telegraphed his attacks and kept inviting me to stab him in the head.
I obliged.
Just 1-3 and 1-4 left.