Thread:Project:Support desk/How do I duplicate a skin for changes?

I am currently trying to duplicate the Vector skin so I can make changes to it and keep it separate. I have tried to follow many guides on this site, but the closest I have gotten is for the main page to display skinned, but every other page looks like its missing a stylesheet and the changes I have done to the original vector skin (which I am now trying to do on the duplicate), look different.

I am currently running MediaWiki 1.19.3 if that helps.