I dibble the trees into a nursery bed, where they can gain some size. I use a dibble out in the field, but I would rather dig a hole with a spade and plant bigger trees.
Using herbicide in an area around the tree is a common method, but I don't use herbicides. I try and pull the weeds around them, but don't do so well. I want to transplant sizes that voles and rabbits won't destroy, so my only concern will be deer.