I've been playing steel-string acoustic for 25+ years, and I'm becoming more interested in classical guitar playing. While I'm fairly good at fingerstyle, I'm aware that making the leap to classical/flamenco playing is not going to be simple or quick. (For example, I was able to learn Mood for a Day well, but it was a long process for me.)
My question is: What basic skills would a good rock/folk guitarist need to learn in order to evaluate this situation? Is it all about posture and learning to play melodies on top of chords, or is there more to it than that? (I strongly suspect there is.)
My ultimate goal is not to become a classically-trained player (years of lessons just isn't an option at the moment) but, rather, to learn enough techniques that I can use them to supplement my existing skills and keep my playing from becoming stale.