Another ex classical guitar player, also self taught. Having very small hands has always hampered me but the harp is more lenient to that. Right hand felt strange because ring finger plays higher notes than thumb. Hardest part is cutting of nails which are so useful in daily life!
Knowing harmony and simple arrangement helps!
If one aim at self arranging movie Music, ballads, simplified classical tunes and arias, it is still doable self taught.
I regret that the most lesson dollars I had was on voice and not at all transferrable. Wind instrument background does not help in a big way, like voice u don’t directly deal with harmony and like voice much more portion of lesson dollars are on the production of the basic tone. The direct interaction of the string in guitar playing was immensely helpful.