Download the skin you want to use as your skin, rename it char. Now go to %appdata%, go to .minecraft and open bin. Open minecraft using a rar file opener (winrar,7zip,etc.) Now, go to mobs and repace the char on the minecraft with your renamed skin. Close everything and open minecraft. You now have your skin. Hope you enjoy!
You can go on Planet Minecraft, go to skins, and procurar what skin you would like, click one then scroll down to find "Download" then click Change My Skin! and then log in, and your skin is there! :D
