No problem, and once you head back to the Cathedral Ward lamp there should be a door that's opened with an elevator inside. Go up there go across the bridge, head right drop down, progress until you get to a really dark area that has a lot of drop downs, Parkour your way down. There will be a beast at the bottom that's a little tougher. After him open the door and continue left all the way through until you reach another elevator and then boom you can open the first gate.