I harvest them all season long, my Green Star Elite juicer which is especially good at wild greens which saves me a lot of energy chewing and digesting.

Nettles can really hurt though as most knows, the trick is to not touch the upside of the leaves and avoid stroking motions. I usually do without gloves and just be steady and precise. If I get tagged I just take a leaf on the downside and roll it into a ball. Then just rub the place where it hurts and it works as an effective antidote.