my hand is still sore from 2 hours of the F a few weeks ago....man it gets frustrating huh..but if ya hang in there & muscle memory kicks in..then its there forever,,but ya got to run the shapes over & over daily..i struggle bigtime..my fingers do not cooperate or have the reach...Found out its my eyes a lil...At nite i sit on Sofa..and work on chords..noticed something..if i tilt the fret board towards me.. can make the shapes better...sorta like a lap guitar.