Yesterday was a good day for me. After a few failed attempts on the Eye of Cthulhu, I finally managed to slay the beast. My main problem is that I'm not twitchy enough to be effective - I'm rarely able to dodge it when it dives. Also, I found my winning attack combo was shurikens first, then flaming arrows after it transformed. Was still a nail-biter. But now that I got the demonite ore and crafted a sword and bow from it, plus found 4 more crystal hearts to get 320 life rather than the 240 I had before, I bet it'd be a cinch next time!
Though I think I may head for the dungeon and harvest some of the nice green brick for base-building, and then start a fresh world with the new gear, because my base is an ad-hoc shambles. Plus going to a new world seems to be the easiest way to get copious amounts of wood.
Don't place any of those blocks underground, otherwise you'll have monsters spawning in there and npcs refusing to move in also. (Because dungeon blocks underground counts as a dungeon to the engine).
I've gotten some good gear recently, got a shadowscale mail set and also some meteor mail, and a nice purple phaseblade. Been to the jungle a bit as well, there are lots of cool items to be found.