How to Download Skins
Simply right click on the picture you want as your new minecraft person
Then go into Minecraft and open up the texture packs folder under "mods and texturepacks"
Then select the texture pack you want to edit
hit "extract all" and select the extraction location
rename the skin "char"
open up the "mobs" folder in the texture pack
simply drag in the skin
a window will pop up saying "char already exists in this folder, would you like to replace it". You want to select yes
then download a program called 7Zip
select all the files in the texture pack
right click and mouse over 7Zip
hit "add to archive"
then select "ok"
drag the zipped modified texture pack into minecrafts texture pack folder
select the texture pack in minecraft
star the game, check it out, and enjoy!