How can i Hex and make something work in addon folder

Hey you guys i just wonder if someone can help with that… cause i got my personal skin and all… and i want to keep the original…
an i how can i make something work in the addon folder EX:My personal skin

Thank you

…What?

He wants to know if he can put a skin on in game but keep the original. Maybe if he doesn’t like the personal one, he go back to the original one.

Why would you override a model instead of making a new one?

Well this isn’t the tutorial I originally used, but it looks detailed enough:

http://www.facepunch.com/threads/303805-How-To-Hex-Your-Own-Weapons-Into-GMod-A-Very-EPIC-Detailed-Tutorial