I have already attempted to learn the vibrato technique. I have watched many technique videos and have developed a personal checklist of things to do/not do. I use a guitar aid – an expandable section of guitar neck- that I take to work and use on breaks to work on technique. I am trying to build both muscle memory and proper technique by slowly going through the motions, while analyzing finger placement, proper thumb position, wrist remaining straight, motion toward my left shoulder, etc. I have found that learning this way worked for me when playing guitar, so I am trying it with the violin. I just started, but already I am getting closer to being able to execute vibrato. When I first tried it a couple of weeks ago, it felt so strange that I thought I would never be able to get it. The guitar neck trainer (bought on Amazon), along with many videos (especially Michael Sanchez’s) and 10 or 15 minutes a couple of times a day seems to really be helping!