first time i took my head off i tried the two nut method but for the life of me i couldent get it to work. they needed to be replaced anyway, they were not straight at all. (well i guess they were chinese straight lol)Put two nuts back to back (double nutting) and use a wrench or socket to unscrew them. The nuts need to be tightened together first. You'll need hex nuts not the acorn ones that come with most engines.
Tom