Practice doesn’t make perfect — practice makes permanent.

I play guitar with my thumbs.

Not just my right thumb — it’s normal to use both the thumb and fingers when you are picking the strings — but my left thumb, too.

On the frets of a guitar, you use the fingers of your non-dominant hand to hold down some of the six strings, at precise positions, to play different notes. To play a chord, a guitarist presses a number of different strings on different frets with one hand, while strumming or picking with the other.