When I started my trees, I collected fallen fruit from a tree that I spotted in town... took them home and kept them in a bucket over the winter (outside).
Eventually the bucket filled with rain water and the fruit softened.
I mashed everything with a potato masher or something, and dumped the slurry in trenches.
I had so many seedlings come up as to not be believed...
Unfortunately, I got busy with other stuff, and didn't get the trees moved...
they're still growing, and producing their own fruit.
A year or two later, i planted two more balls in another section of the garden.
I got like twenty trees out of one clump.
I moved them where I wanted...
And... Its so dry here... most died.
So much for a fencerow here in the sandhills...
sucks that they only grow in the garden... and the black walnuts too...
Anyway...
not hard to start... if you can find a source of ripe fruit.