So, you expect to get away with paying me one bob instead of two??!! :O

You do it justice by playing it & by enjoying your playing & by enjoying it. It doesn't matter whether you're Julian Bream or Frank Fumblefingers. That's also worth remembering... ;-)

As I suggested above, if you find you're getting frustrated with summat, just leave it alone for a bit & practice something else instead. Come back to it later & you never know... And never be loathe to chuckle at yer cock-ups. Good humour is not a bad teacher!