Skins - How Do I Chose Them?

[JqD2]

I have downloaded several skins but before I unstall them I wanted to ask what happens when you install more than one?

 

If you can do that, how do you then chose which one to "wear?"

 

Thanks from a Wet-Behind-the-Ears Novice Padawan Beginner's Apprentice

 

JQD2