Okay I understand that the fine tuning argument states that the earth is finely tuned for human life and that when you think about it the possibility of it not being made by a creator is near zero.
The argument in premise-conclusion form:
P1. Assuming a designer, then fine tuning is very likely.
P2. Assuming no designer, fine tuning is very unlikely.
C. Therefore, fine-tuning is strong evidence for a designer.

I really don't think that I'm understanding the concept very well.
I'm trying to argue against fine-tuning, but need to know if my argument will hold. Thus, why I am asking for more information on the subject. Please don't be an a**.