The Principle of Contingent Causation: The Impossibility of Infinite Regress.

[Bucky Ball]

Nope. 
Waiting for a demonstration of a specific idea, (First Cause) actually is the absence of a metaphysic.
I have no concept of First Cause. It's not a metaphysic I share. 
I'm actually not pedantic or special enough to have a (snort) metaphysic.

You do have an idea about what a First Cause would have to be like. You said it earlier.

You said that it would have to be demonstrable through data. 

The belief that true things about the world must be demonstrable through data is a metaphysical belief. It cannot itself be proved by data. 

This is a good introduction:

https://www.amazon.com/Metaphysics-Very-...352&sr=8-1

Please quote where I said what a "First Cause would have to be like". 
Again, you don't get to tell me what's in my brain. 
I said/meant "if there were such a thing" it would have to be demonstrated. 
It's really not that difficult. 

So in fact you *do* say, that my agnostic position with regard to Pink Sparkly Unicorns is a metaphysic. LOL

I don't need an introduction, ... but thanks for confirming "arrogant and pedantic". 
I am not concerned with your beliefs, and if I need you to think for me, I'll be sure and ask. 
If I don't think about things BY YOUR DEFINITIONS, and methods, or how you find valuable, ... that's not my problem, and there is no reason why I should.
Most people learn that before they are 10.
Right now, there is no evidence for a First Cause, however that's defined, and no known coherent definition. whatever that actually means. 
If and when there is, I may consider changing from "no position".