I just went through this with mine, and it's very easy to do. Kevin is looking at removing the crank shaft with the main gear on it but needs to remove the left crank first. I see by the photo he posted he already removed the circular retainer nut for the left crank on the end of the shaft, so this will or should be easy. Just take a small punch set it against the center of the crank shaft, and give it a wack with a hammer. Be sure to have something to catch the crank shaft on the opposite side as it will slide right out, and the left crank will simultaneously be removed.
Kevin the two larger rings removed just hold the bearings and you can put those back on, I was only referring to the nut that is at the center of the crank that gets removed with a spanner wrench, or in my case I just used some needle nose pliers opened up enough. I think you have that off already.