Take it to Honda and get it removed by someone with the right tools and know-how. There's nothing worse than macho keeping someone from doing the sensible thing; don't fall into that trap. There are other reasons for letting the pros do it, as can be explained by my own experience with removing the retainer (quoting here from my own build thread):
When time came to replace the bearings on my bike, I did some searching on this site and got several good ideas as to how to remove the bearing retainer. I tried them all, and none of them worked for me. I even had the guys down in the machine shop come up with a tool to no avail (Thanks Guys!). The retainer stubbornly refused to budge (yes, I was turning it in the right direction) and all I ended up doing was boogering up the spanner holes in the retainer. I finally broke down and went to Honda, and the guy behind the service counter said, "Sure, we can get that retainer off for you. There could be some trouble, though..."
I said, "Trouble?"
He said; "Yeah, they weren't one of Honda's brightest inventions; these old things get stuck on there, and they can be a bear to get off. Depends on when it was last removed. I've seen 'em break the tool, or they can twist the hub, or I've heard of 'em shattering into a million pieces..."
By this time I was starting to get slightly alarmed; visions of the retainer exploding into shrapnel and taking out the entire shop almost brought me back to the War. But, of course, it had to be done, so I left the wheel and new bearings with him with his promise to call me if anything disasterous occured. Fortunately, the procedure was accomplished without loss of life or limb, and I got the potential WMD back the next day replete with new bearings.
Good luck!