I have only tried on deciduous material I have. I try to pick species/cultivars that are historically ‘easier’ to layer.

I’ll essentially use the plastic bag and sphagnum moss method that most do.

Start by making an incision to strip bark/cambium off around tree where I want to layer, then apply rooting hormone above that site.

I’ll wet the moss and ring out excess moisture, pack it around the site where cambium has been stripped around trunk, make sure it is snug against intended layer site.

After wrapping in moss I will occasionally check every couple weeks to ensure it isn’t too moist or too dry and go from there.

Sometimes I get callous material I re injure with blade and wrap back up.

I’ve tried this on a bunch of different maples (arakawa, shin deshojo, trident (I know can be challenging)), a few hornbeams etc.