Here is a You tube but I would not get along well in our soil with a shovel like that shows. I use a round mouth for sure.
Should not have to worry about growth this time of year but if you have a number to plant you could look into getting some Simazine a relative of Atrazine to spray around the tree and will leave some residue to keep vegetation from competing with the tree for a couple years

https://www.youtube.com/watch?v=_SE6Twcg5AU