To get the iconic Hylian Shield you need to make your way to Hyrule Castle. Do not enter the castle from the front but instead make your way around to the back so you enter it via the dungeon door which is just above the docks. Inside the dungeon walk to the end and battle the boss (Stalnox) in the final room. You will need arrows in your inventory as you have to aim for the the eyeball so it drops out. When this happens destroy it to defeat the boss, a chest will then spawn with the Hylian Shield inside. If Your Hylian shield breaks you can find it again in Tarry Town but only after you find it the first time.