Update: Do not load as intended unless you want a broken hit-detection downward slash attack (yes, affect downward slash only for some reason, side slashes still remain fixed). instead, you want to put the mod under "Sabre-aN's Headcrab Zombie Mod" but at the cost of losing extra poison zombies' variants.

-In Steam, click on "Library" -> right click "Garry's Mod" (on the left side of the screen) -> head to "Properties". Now click on "Workshop", there, it will show you a list of all the mods you subcribe to, you can either manually drag up/down or move them to the top/bottom of the load order straight away by using the two pop-ups upon right clicking a mod

-Its highly recommended to put priority of the mod that makes the change(s) you desire similar to my example since the one under will override the one above

I think I will ask about the arranger. That sounds incredibly useful, you're telling me I never knew I had such a tool? Thank you..