These are easy to install.....you can do one by one, YOU CANNOT install all of them at once

First you want to extract the folder, then you select the skin you want. Second, you will take the folder (ie: Vacumize), and click on it. You will SEE a folder labeled TITAN. This is the folder you will want to put in your C:/Programs Files/World of Warcraft/Add Ons directory and overwrite the files.