First you will need some Bleached Beeswax. I used this brand by Enkaustikos, and purchased it through Amazon. Likely, you will be able to find some bleached beeswax at your local large craft store.
I placed 5-6 tablespoons of the Beeswax in a small sauce pan and very carefully heated it on low heat. (do not allow to boil).
Next you will dip the leaves in the melted wax by holding on to the stem. Coat the leaves with the wax and gently shake off the excess wax.
I placed the leaves on a sheet of tin-foil to dry. I would suggest hanging the leaves, as I experienced a few leaves sticking to the foil. I discarded the hot wax in a canning jar (do not pour down the drain).