Hear the guitar on its own
Solo the guitar stem and the part stops being a guess. A line buried in a dense mix is often obvious the moment the rest of the band is out of the way.
For guitarists
SheetMuse for guitarists
Everything SheetMuse does, arranged around the way guitarists actually learn a song: work out the part, get it under your hands, then play it with the band.
Read tab or chords, whichever fits
Rhythm parts are usually a chord chart; lead lines are usually tab. Both follow the recording, so you can switch depending on what the song asks of you.
Mute the guitar and take the part
Once you have it, drop the original guitar and play it yourself against the rest of the band. That is the rehearsal, and it is one control away.
Capo and key changes
Transpose to land on shapes you know, or to match the rest of the band. The tab and chords are rewritten to match.