Yeah, I expected to need the spindle nut socket to remove and re-install the hub. I have one from a friend, but it's the hex-type like pictured in the above link regarding bearing replacement. However, it seems this won't work for the nuts with the premium Warn hubs, which I have. Didn't know that until now.
The posts I've read said DO NOT use a hammer and flat-head to remove the nuts since you can damage them. The last guy obviously did this and marred the holes pretty bad. It looks like the socket will need prongs (like 'gmakra' mentioned) to fit in the holes that are now screwed up. Probably won't fit now, and will need new ones once they come off. besides, my hammer won't provide accurate torque to re-install the current trashed ones. Since these hold on the wheels and protect the bearings, I want the torque to be correct.
Another great post is this one for replacing most everything in the front-end: