Howdy Hood! Aquafortis is easy to use. After sanding your stock (DO NOT USE STEEL WOOL!) apply aquafortis with a cotton cloth or cotton ball. Use a heat gun (or hair dryer) to activate the aquafortis. Don't scorch the wood however. You can apply more aquafortis and repeat the process to get a darker color. You can also check Track of the Wolf. I believe that they have a downloadable instruction sheet for using aquafortis.