As you follow the arete up and leftwards from the nose, it is smooth until it encounters a small overhang with a crack below it. This climb starts below this break in the arete. It starts up a finger crack, the gets wider and steeper as it ascends, to a surprisingly steep lay-back section. Intimidating for a 5.4, but takes good gear all the way.
At the top, step right to a small triangular ledge. There are two old pitons slung as a rappel anchor. If belaying from here, backup gear in the crack up and left from the ledge might be a good idea.