Animation Issue, how can I do this? Transparency and animation

So, I've run into animation troubles. I want to make an animation where this guy grabs two guns from his side and pull them up to his hands, holding them out in defense. But I am unaware of a transparency script for that specific instance.

You can make his bodyparts transparent like this.

Example:

local body = script.Parent
local hum = body.Humanoid
local animation = script.Parent.Animation
local animationTrack = hum:LoadAnimation(animation)

animationTrack:Play()
body.LeftHand.Transparency = 1