The good thing about building callouses is playing is so much fun you just can't help it. I love the acoustic guitar. I did get an electric but I find that I do more fiddling with all the knobs and settings than I do actual playing. I like to pick up the acoustic and just play. Something about the way it sounds I guess.

Dents in the fingers yeah that means your almost there! Funny..the guitar got me into the piano. I find the theory of music much easier to figure out and understand on the piano, then on the guitar it doesn't seem quite as difficult to grasp. Good luck keep at it!,

Ed