fishron is hard, yeah, but very possible. all i do is fly around in a zigzag form while shooting/using magics on him. i've never beat him using a full melee character because i use a hybrid loadout on my main. i keep vamp knives on range so i have an alternative heal to potions.

1.3 is complicated? hey remember when starbound/terraria 1.2 came out

EDIT: nvm on the melee thing, pretty easy to beat with post-frost moon gear, must have misremembered