Get on Epona and ride over to the Western gate (GCN) which leads to Lake Hylia and the Lanaryu Province. Align Epona at a slight acute angle with the gate. (The less space between Epona and the gate, the more likely you are to clip.) Sidehop into the acute angle and role into the gate. If you setup Epona's alignment properly you should either: 1. Immediately roll through the gate. 2. Crash into the gate, and as you stand back up, get pushed through the gate by Epona. After voyaging part-way into the province, you will be warped to the Great Bridge of Hylia, by the Twilit Bulblin cutscene.
If you have not preformed the Early Master Sword glitch, you will not be able to complete the twilight (since you can't turn into a wolf to kill the bugs), and will therefore be unable to finish the game. This trick is also the only way to overcome the EMS deadend which prevents you from entering the Goron Mines.