Three years ago I wrote an article on my website describing the way I use Sibelius to write scores for the classical guitar and I offered some downloads with the special symbols I use. There have been many updates and new versions of Sibelius since. And some users have complained that the files provided didn't work well any more. Hence I have made a new set of files which can be downloaded from my site. It holds three plug-ins for adding fingering and positions, a feature set with my keyboard short-cuts and a Sibelius document including all the special symbols.
You can download the files from here: http://www.bergmannedition.com/update-s ... ic-guitar/