Im new to computer games that let you change the gameplay appearance. So realisticly I have no idea how to do it. I see people are changing the player skins and gun skins and I want to try out a couple ideas of my own. What program(s) do you use to do it? and what is the difficulty level on a scale of 1-10. Im probly at 3, or a -1 to some of you. Any help would be greatly appreciated.

do you just put it in the ace of spades folder?