This picture was very useful when I climbed this route a few days ago.
One can also go straight up the crack from the base of the diagram here. It's a bit harder but does not have the exposed traverse that may unnerve some.
We went right up the crack, which took us to a good ledge below the "hard" chimney. Since our beta suggested traversing across a small crack/ledge with significant exposure to gain the "easy" chimney, that's what we did. However, we descended using the so called hard chimney, which was an easy enough downward shimmy, and had the advantage of dropping us right on the good, wide ledge directly above the crack. From here we descended the crack and went on down.