Frank,I agree, I find it very difficult too,and I realise I will never be as good on it as I am on the concertina.
one reason, I find it so difficult,is unlike fretted or free reed instruments,you have to adjust your pitch as you play,for me a completely new discipline.
like most musicians I allocate a certain amount of my practice time to improving certain areas of technique,and a certain amount of my time just for playing for pleasure.
But I think as we get older it is really important to keep the brain active,and to keep attempting new musical challenges,although the fiddle is probably my fourth or fifth instrument,I keep hoping I am improving as a result of regular practice[I try to allocate half an hour a day to it].Happy New Year Dick Miles