Depending on what type of trees you may be able to leverage the natural forest system to do the planting.

Eg: I have wild Hazelnut or Filbert trees on my forested property, for the first couple years I struggled with transplants dying and then realized the squirrels were planting them too! Now I just keep the coyotes away(also to protect my chickens) and the squirrels plant the Hazels.

I also clear dead fall and gently rake areas where I want to encourage new trees.

I have found that a tree that starts naturally or from seed tends to do better than transplants, atleast in my area.