Pick a dandelion in bloom. Rub with the yellow center of the button on the spot where the nettle has pricked.
Bruise the leaves of the plantain and rub it over the itchy spot. Works very well as immediately after the start of the itching is coated the place.
Rub the spot with toothpaste, after a few minutes the itching disappeared!
Instead of plantain; Also working against itch by nettles is ground ivy. Additional benefit; nettles and ivy like the same soil and shade conditions, so that there are always nettles growing ivy.