ksn0va said:
They're not really that difficult. Most just require planning and preparation.
A lot of planning and preparation, though.
To face the Wall of Flesh Solo, you'll just about want to make wooden platforms across the underworld, flood the underworld even though it evaporates, just so a layer will of lava will turn to Obsidian and not be a danger to you. Get a pair of Rocket boots and Cloud in a Bottle, invest in buying a Minishark, invest in turning a Minishark into a Star Cannon, a Demon Scythe spellbook, hundreds of ammunition for your Minishark or Star Cannon(or hopefully both), all the hellforge items(that includes a boomerang), loads of restoration potions, max health and mp, an ironskin potion, a magic potion, and an Obsidian Skin potion, just in case you didn't build enough bridge.
And it's STILL possible to die. Especially if you don't manage to multitasking keeping both your HP up and keeping distance from the Wall of Flesh at the same time. (You get cornered, you get lots of damage, it's best to keep no pillars hung up high in the sky. Take those Obsidian bricks and add them to your home, and take those hellforges and put them in your home once you get the Molten Hamaxe. You don't have to worry about them being melted in the lava if you make a mistake, and you don't have to worry about those towers jutting into the sky getting in your way)
And all of this preparation takes loads of hours to accomplish.
Personally, I recommend a sandgun. Because sand is the easiest ammunition to get a hold of. But that costs a lot of money to make. If one actually cares to earn it, the quickest way I've found is to face loads and loads of earth eaters and sell their remains. About 20 worm foods should be plenty prepared to have a boss rush and afford the illegal gun parts.