Replacing alternator issue?

So, I need to change the alternator, got a new one in the passenger seat. Now the problem is that I can't find the second screw for the alternator. The first one was easy, it was pretty accessible and got with the 17mm socket. Based on the new alternator, the second screw should be one hand-length down into the car, but I can't find the head of that screw, is it on the other side of the alternator?(So basically under the intake manifold). Would I need to remove anything, like the intake manifold, and how do I get the belt off. I think I found the belt tensioner, but it's connected to another belt, the belt connected to the alternator only has two wheels, the engine and the alternator.