Step 5: How to install
Add a few stiff wires to an anchor point on your tree charm, then bend the loose ends into hooks. These hooks will act like barbs and will catch a branch of the tree when thrown into the foliage. This method may not be suitable for all trees, and you risk loosing your tree charm on any given gusty day. This may be part of your aim, if you want your tree charms as a temporary display only.
If your tree allows, you can climb the tree and find a branch that suits your needs (and comfort with heights), and simply wrap a length of stiff wire from your tree charm to the branch. Securing it against possibly windy days and keeping your tree charm in place for the long haul.