Thought i might share a tip that I've found useful on both of my playthroughs, if you find yourself getting a flight potion flask or bottle, use it to fly around the nether gathering ores such as redstone/diamond. Sticking 1 nether redstone ore in a TE Pulverizer gives you 24 redstone which is quite considerable early-mid game. Since you can fly, mobs such as the hellfish and pigmen pose no problem, and you can obtain blaze rods much easier if you find a fortress