Go to Kakariko Village. There get a Pocket Cucco from the Cucco Lady and use it to wake up Talon who is in one of the houses in Kakariko Village.
Go back to the Cucco Lady to get Cojiro. Use him to wake up The Carpenter Boss's son. He is sleeping next to the Skull Kid's tree in the Lost Woods. He will give you a Mushroom to take to the old women behind the Potion Shop in Kakariko Village. You have only a limited amount of time to do this so use Epona.
Give the Mushroom to the old lady. She will make a Potion for the boy. (Now that you have given her the Mushroom you can come back here later and For 100 Rupees you can buy some for The old lady's Ultimate Potion.) Go back to the Boy in the Lost Woods.
When you get there a Kokiri Girl is standing there. Give her the potion and she will give you a Poacher's Saw. Give the Poacher's Saw to the Carpenter Boss. He will then give you his broken Goron's Sword. Go to The top of Death Mountain. You Will find Biggoron Give him the broken sword. He will not fix it until you gite him some eye drops. He will give you a Prescription.
Take It to King Zora. He will give you a frog. take the frog to The Scientist at Hylia Lake. You have limited amount of time to do this so use Epona. The Scientist will make you the eye drops. You have limited amount of time to do this so use Epona.
After you give the eye drops to Biggoron. He will fix the sword. But it will take three days. use the Ocarina and the Sun's Song to make the time go by fast.
After Three days you can get your sword from him.
