For me, the most difficult thing is that I am learning melodies on guitar from some songs whose melodies were not meant to be played on guitar. Ever. They were intended mostly for keyboards or melodic percussion.
Dweezil ZappaThe Silvertop and the Goldtop both had subtlety where it was needed but lots of definition as well. I liked the different voicings of the distortion/fuzz elements.
Dweezil ZappaWell, Steve Vai joined my dad's band right around the time when I actually started playing guitar. So he gave me a couple of lessons on fundamentals, and gave me some scales and practice things to work on. But I pretty much learned everything by ear.
Dweezil ZappaModern records are all made with virtually identical gear, software plug-ins and everything. Everybody wants everything to sound like the last thing that was popular because they're chasing their tails.
Dweezil Zappa