Sounds like a Lee Oskar tune, and I really don't have blisters (yet). But I'm brand new at guitar and am wondering if anyone can advise me on how long it takes for the callouses to build to the point where I can practice scales and chords for more than 10 or 15 minutes at a time? And what about fat fingers? Really hard, right now, fretting a string without impinging on its neighbors. Any suggestions? Determined to continue...