I'm trying to figure out how to kill skeletron in expert mode. I think I'm gonna need some asphalt.
asphalt is hardmode only though, unless you can get a blend-o-matic from another world
what I did instead was use spectre boots and the kachuchu shield for dodging, and had heart and mana statues hooked up to a timer, but I got the wires and stuff from somebody else
you should be fine without any of that if you have enough potions (regen, thorns, ironskin, speed..) + minishark/maybe star cannon
if you want better healing potions, you can go fishing in honey for honeyfins which heal 120 each
and just a really long flat arena helps a ton, especially with the camp fires + heart lamps