How install and use ffmpeg on Mac OS X?

I’m pretty well into computers but not a full fledged geek.
Have tried to understand how to install and use ffmpeg but feel like a five year old.
I’m on Mac OS 10.6.8 Snow Leopard (tried Mavericks but reverted back).
As far as understand, I need Xcode which I have installed.
Then I need either MacPort or some other app I don’t recall the name of.
Then I’m supposed to use the Terminal to download whatever files needed.
Then I’m completely stumped. How will I then use the converter? Where’s the interface?
I don’t understand anything.
Can someone please explain how to download, install and use ffmpeg as if I actually is five years old?

I’ve never used it, but it appears the interface is not a GUI but a CLI

If you’re not familliar with using the command prompt, do yourself a favor and check the documentation often and take it slow.

I’m guessing that after you get everything set up you’ll have less trouble using the API

You should consider using the newest version avconv since ffmpeg is deprecated.

As for installing the lib that is going to be a tall order without experience compiling software from source. Though a quick google search revealed some possible solutions.