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I agree with everything from Dan, but I wanted to add the following: I was in the same boat as you a few months ago, when I got my first report. If you're like me, you're next step might be "should I touch a page, if it's ranking well?" I optimized all the other pages first, and then, eventually decided to go ahead and optimize the ones that were ranking well, too. I was nervous this would somehow hurt my rankings, but it didn't. Everything stayed the same or moved up where possible. At least, now I know, I have that step taken care of in case someone else starts trying to go after the same keywords.