How would I figure out the opposite vector of CurrentCamera.CFrame?
What do you mean by “opposite” here? Just looking the other direction? The inverse? Upside-down?
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Looking the other direction 
Your post isn’t very clear, could you provide a visual or example of what you are trying to accomplish? Are you looking for the opposite direction the player is looking, Something like
-CFrame.lookvector?
https://developer.roblox.com/en-us/api-reference/datatype/CFrame
Useful article:
https://developer.roblox.com/en-us/articles/Understanding-CFrame
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Yeah! Imagine rotating the CFrame 180 degrees on the y-axis. This is enough as I only intend to use the y-value of the CFrame. I multiplied the CFrame with CFrame.Angles(0,math.rad(180),0) to fix this. Is this the easiest way?
It’s unclear what “opposite vector” refers to but as mentioned above, simply applying a negative would give you the opposite vector. That’s assuming you’re using the Look, Right or Up vector to get a Back, Left or Down vector. A rotation should work, you can test that out for yourself to know more quickly than waiting for a response here. 
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