Newbie Q re editing .mp4

Question

I have an oral history in an .mp4 file. It's about 30 minutes long, and I need to do two things. First, I need to divide it up into 2 or 3 shorter files. Second, I need to delete a few minutes of off-topic chatter.
I assume GarageBand can do these things, but I've never used it before and when I opened it, I got kind overwhelmed.
Is GarageBand the easiest thing to use to do this? If so, can someone point me toward instructions that can be followed by the technically-challenged?
Or is there some other, easier, way to do what I want?

Answer 1

I need to divide it up into 2 or 3 shorter files.
http://www.bulletsandbones.com/GB/GBFAQ.html#exportsections
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I need to delete a few minutes of off-topic chatter.
http://www.bulletsandbones.com/GB/GBFAQ.html#cutsection
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http://www.bulletsandbones.com/GB/GBFAQ.html#cutsectionnospace
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Is GarageBand the easiest thing to use to do this? I
i'd choose an audio editor:
http://www.bulletsandbones.com/GB/GBFAQ.html#audioeditors
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but GB will work fine