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 impulse of the vibrato starts in the fingertip and then continues through the rest of the finger hand, Its important to get the feeling for what this initial impulse shake feels like so that you Developing Violin Vibrato The Instrumentalist Amazon.com: 3 Rolls Violin Fingering Tape, 3mm Violin Finger Tape Cello Violin Fingerboard Stickers Finger Guide for Violins & Various Orchestral Instruments Fretboard Note Positions (Black) : Musical Instruments