I had to cheat, but I beat skeletron.
No, I didn't take hardmode items from another character. The only condition I do that is if I REALLY don't feel like farming, and I don't steal stuff beyond my point in progression.
Anyway, I did it by setting up a rail in a loop, I had to adjust the size several times but I eventually got it to the point that skeletron barely ever hits me. The only problem is that you can't aim, so I had to get some mage armor, a hive pack, and a bee gun to do the fight.
It took several tries even with the rail and the bees but I eventually did it right before it became day
Anyway. I did a bit of fishing in the dungeon, and killed a few enemies for keys and used a duplication glitch but long story short I have the nights edge, shell phone, obsidian shield, and several other items I would need to progress through the game.
Now I'm trying to fight the wall of flesh, but through two attempts I learned that the hungry deflect projectiles, just like skeletron. F U N.
However the eyes and mouth don't, so if I clear out enough of the hungry I can deal massive damage before I get to the end of my platform.
But there's another problem, the wall also summon special fire imps that shoot fireballs that don't break when you hit them with a weapon, AS IF THE FIGHT WASN'T PAINFUL ENOUGH