We have a few walnut trees, rhey are all quit old, some yrs are better than others, we just let them drop off the trees in late summer to early autumn, then collect them up and (wearing gloves) you will need the gloves on as the outer fleshy part thats either pretty dry or starting to go to mush stains everything with a thick black die, dont do as I did the first yr I was over here and de shell them with out the gloves, my hands where black then yellow for weeks, we then leave them in the sun to dry our totally for a few weeks and bag them in mesh bags, they will keep for a yr or si if no moisture gets to them.
then we will sell them in the spring or roast them on the fire and eat mmmmmmmmmmmmmm luvvvvvverly