Adding a simple infantry animation

[Drake3571 10]

New to Arma2 modding. Want to start off with a basic animation that rotates the wrist 180 degrees left to right in all infantry units, so I started looking at Arma1 tutorials and wikis. Been following this one

http://community.bistudio.com/wiki/ArmA:_How_to_animate_a_model

I unpacked the config.bin from characters.pbo and characters2 but nothing helpful. Is there a more hand-holding tutorial? Can you change the Infantry class so all units inherit the new animation from it or do i need to make my own custom unit? Thanks.