Sight reading can be a delicate subject with classical guitarists. I think maybe because so much of what we do is "okay, if I use this finger on that string for this note, then I might be able to play this other note with that other finger." I am not suggesting that sight reading isn't useful. It is. But maybe it isn't AS useful as it is to other styles of guitar. Maybe.
I once had a professional jazz guitarist studying with me for a while. He got it in his head that he wanted to go to grad school for classical guitar even though he was a jazz guitarist. Actually, lessons went well. He was a great student and progressed quickly. In a nutshell, here is what he probably learned the most from me: "You are already a great musician. You know how to play well and with great expression. But for some reason, you are afraid to do that with classical music like you do with jazz. Give yourself permission to play this music the way you already know it should be played."
Anyway, one day he came to the lesson and was most concerned and very serious because auditions were soon approaching. "Todd, we've never talked about sight reading in any of the lessons. Do you think it will be good enough?"
With laughter and a twinkle in my eye I said something like, "I am actually very jealous of your sight reading abilities. It is all of those years of playing from jazz scale books, melodies an octave higher, and playing them all over the fret board. You're not going to have any problems with the sight reading."
And he didn't.
But if you really want to learn something about sight reading...based on my experience, talk to the jazz players!
Dr. Todd Tipton, classical guitarist
Cincinnati, OH, USA (available via Skype)