I hear that when fingers build calluses, left and right hand pizz get easier. I'll never know. I've tried everything. My fingertips have the texture of a soft boiled egg. But I try to stay in rhythm The vibrato motion starts in the fingertip and its important to feel it moving evenly as you vibrate, This rotation motion done with the finger is what moves the note from below the pitch up to the Fourth Finger Vibrato Tips l Violin Tutorial Developing Violin Vibrato The Instrumentalist