It's always going to be plenty of physical effort! In terms of the mental overhead: there are some letters/motions like R, F, D that just feel second-nature alr

It's always going to be plenty of physical effort! In terms of the mental overhead: there are some letters/motions like R, F, D that just feel second-nature already from lots of practice and more 'obvious' positions, but I still have to think about most of them. A few letters still trip me up, like remembering M versus S (mirror images). I'd love to find a seasoned signalman to get their take.