Prepare For Hell

Next you should prepare to go mining once again, this time you will be digging all the way down to the underworld. Gather all of the torches you can and go ahead and start digging! Grab whatever loot such as: Crystal hearts, and chests along the way. Once you see lava you know you are near the underworld. Keep mining and in about 5 or so minutes you should be right by it if not then in the underworld.When in the underworld you want to be very careful because there is lava everywhere and strong monsters as well. Now you are going to have to face The Wall of Flesh which will put you into hard mode. So in order to prepare for this fight you will need to make a huge line made out of wooden platforms because you cannot go around The Wall of Flesh. Make sure to get good items before you face The Wall of Flesh and enter hard mode like an Imp staff, or just any good weapon. Keep in mind by hard mode it doesn't mean Hardcore difficulty. Make sure you have a good mode of transportation like Hermes Boots, Rocket Boots, or a Cloud in A Bottle.Now when you want to summon The Wall of Flesh you have to kill demons in the underworld and they will drop a Guide Voodoo Doll, which you will drop into lava and then The Wall of Flesh will summon! Use health potions, and have some sort of a ranged item to not get hurt from The Walls Eyes. Just make sure you don't run out of platforms because then you are screwed. Once you defeat The Wall of Flesh you are then officially in hard mode, and he will drop a random item as well with the PwnHammer which will allow you to mine altars which triggers more hard mode ores to spawn across the world. While you are in the underworld you can go ahead and mine some hellstone to get better armor and tools which you will need later on.