Mike, best bet is probably to go to the Mac App Store (on your dashboard) and search "video editor". There are several for free, so maybe just try each and see how usable they are. If it sucks, delete it and download another. I have limited experience with this stuff, but I'm gonna bet there's a reason Final Cut Pro costs $300.
Also, you might get away with using iMovie, which is already on your Mac.
BTW, I just bought one of your Powerscenders today. Cant beat that price!