I have taken several beginner lessons and note I have a few problems that may not be surmountable physically for me and thus perhaps the Upright is not appropriate for me. I have an unstable thumb commonly known as a Z thumb, that is, hyper-extension of the inter-phalangeal joint of the thumb which makes powerful squeezing difficult. I do notice that Rabbath does have this as well and certainly he is a world class player, but still my thumb has this difficult anatomy which makes guitar playing a bit difficult as well, but I do manage nicely. I also note that pressing down on the strings is quite uncomfortable to my finger tips. I am a long time guitar player and electric bass guitar player and can handle the pressure of fretting with callus build up with relative comfort. But I have very thin bony and delicate fingers with very little flesh (I am very slender and light framed) so the huge strings of the upright tend to be very uncomfortable if I try to use finger tip pressure and I doubt callus formation will be a solution. This seems to be more of a flesh padding situation. If I use the pads of my fingers, then the tone is not very good. I am beginning to suspect that the upright bass is too physical an instrument for me. Can you comment on whether some players for physical reasons just cannot conquer or become comfortable on upright? I do adore the tone of the upright and have borrowed one from a friend, but I am beginning to think that for my delicate body construction, that playing it will be quite a struggle and uncomfortable long term. AI tells me that this is a common impediment to playing this instrument. This combined with the expense and massive size of the instrument is beginning to make me think that playing it may not be appropriate for me. I am most interested in your feedback about finger tip padding and pressure problems (not calluses which I already have) and unstable Z thumb configuration of my hand. Thanks for you thoughts.