I am a begginer in classical guitar, but I have a good music theory from my other instruments so that makes me very perfeccionist while learning the classical guitar. I bought a Yamaha C70 1 week ago and I'm having some doubts about left hand position.
Classical guitar teachers are more than a hundred miles away from me, so I decided to started this for myself, but always searching for perfeccionism in ergonomics and posture, to avoid bad habits.
Today I took a hour just to adjust my left hand position to an absolute straight wrist position (just for basic hand positioning, I know that sometimes this isn't possible), so I can get almost no effort and avoid technique problems and injury.
My fingers are very long and thin so I think the straight wrist, even in the six string, isn't a problem. But I find that I can only do this without effort if the top of the headstock is a little above the top of my head. If I reduce the guitar angle, I can make the wrist straight, but I have to adjust my elbow in a way that causes shoulder pain.
In the first case, also I could notice that my fingers are far more loose, and I can reach the 4 first fret, with each finger right before each fret, without a problem, and the fingers hit the strings in a 90 degree angle. This doesnt happens if the guitar is in a lower angle.
Both cases my knuckles are parallel to the neck
My doubt is that is there any problem of putting the guitar in this position?
I was thinking of making a video and post on youtube, showing the different positions, if necessary.
Sorry for the vocabulary, english is not my native language