Material of more than 8 mm in diameter should be crushed by hand, cut up with shears or ground using a biocrusher.
Damp material should be mixed with dry material. If the mixture is too dry, it should be moistened, but not too much.
The mixture should be homogenous. We have to try and mix materials with a low nitrogen content (hay, sawdust, prickly pears, etc.) with those that have a lot of nitrogen (animal dung, tender plants, grass, etc.).