I've posted a really good video on here twice.
I'll have to find it and watch. Clay soil I have plenty of, and the eqpt to dig the holes and stir it up.
That urea is making the wood chips pretty black. In the 80 gallon tumbler, with wet leaves, the chips are getting dissolved. The leafs seem immune. I put a lot of urea in there, and will add more chips today. I have a hunch that tumbler stuff will get put in a 100 gallon tub, and made into a worm bed to further decompose it, especially the willow oak leaves. I already have a bin with nothing but peat and worms. The idea is to use 1/3 peat, 1/3 compost from those two worm bins. The rest will be amendments and drainage. No idea if it will work, but I bet it does.
I like the soil pH to be above 7.