Yes, if I recall there's not much torque to them......16 ftlbs? If I'm right that's not much. I have both the Clyman and Honda shop manuals. Lot of info there I'll never use, but heck, the info you can get out of just a few pages! I'm going to go with open nuts. It's easier all around I think.You may already know this stuff, just in case.
Be sure to follow the torque specs on bolts for pipes, so you don't break off the header bolts. You may want to put some washers under the acorn nuts on header bolts or just replace acorn nuts with regular nuts.
Use new header gaskets, don't reuse the old ones. After you ride for about 100 miles torque the bolts to spec again. I learned this from the awesome guys on this site.