This step is rather simple but important and feels great: Rub a nice thick foot cream or lotion on your feet and legs, moving in an upward motion, A nice touch is to add some drops of peppermint oil to the lotion for a tingly feeling. Additionally, you can find heel creams with shea butter.
For even more hydration, try a foot mask, similar to a facial mask with one exception -- after you apply the mask, you typically want to wrap your feet in plastic wrap or plastic baggies while the mask sets -- definitely not something you do to your face!
You can find various products at the drugstore or beauty store. Or, for a homemade mask, blend a few cucumbers, with some lemon juice and olive oil. Put equal parts of the mixture in two baggies, slide your feet in and relax.
After 10 minutes or so, remove and rinse your feet, moisturize, and continue onto Step 7.