First I strip the leaves by pulling the nettle through my clenched fist. Leather gloves are a boon at this stage. I gently bashed the stems on a flat board to open them out and make them easier to work.
Then I carefully separated the fibres from the pith. This is easier to do when the nettles are fresh. And then split each fibre bundle into four strands.
I then start by tying together four strands, holding the knot in my left hand. With my fingers I twist two strands together and then the other two strands get twisted together all in the same direction. This leaves me with two partially twisted bundles. I now want the two bundles to twist together into one cord.
Twist the two bundles simultaneously, close to the hand holding the knotted end, as if you were a cowboy rolling a cigarette, and when tight, release the knotted end. The bundle should spin together. Hold the cord at the junction of the newly made cord to stop it from undoing, and repeat the process...
Before you run out of the initial fibres, add new ones by simply laying them along side the originals, they will twist in as you go. I had to pay attention to the thickness of the cord as it was made. Add more fibres if you need stronger cord.
After a bit of experimenting I managed to make cord strong enough to use on a bow for friction fire lighting. But thats another story...
ENJOY...