Warning: Wall of Flesh [Possible Spoilers]

As you may or may not know the Wall of Flesh is one of the new bosses as of 1.1. It is summoned by dropping a guide voodoo doll into lava in the underworld. This boss is a real nasty one with 8000 health and loads of ways to deal damage, not to mention dealing with the regular mobs in the underworld.. Edit: For some reason I couldn't get bullets to work yet when I copied and posted it as a comment it worked fine so check the comments for some tips. TL;DR