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Egol and Moosa are spot - a couple of things to add. I suggest do not first work on your most important pages first. With the new search analytics in WMT's you can learn a lot about your website - easy and quick now to monitor page change outcomes. Train on a few lesser important pages, some might have more traffic, then go to your most important pages. If you only change the meta description - monitor CTR on WMT's. If you change the title and meta description - spread sheet both Clicks and CTR. When changing Title often the page rank and even the CTR can drop but total clicks increases. After you have optimized a few pages and found out why people click, comfortable with the results, made your mistakes:- Then armed with that knowledge focus on your primary pages, and you will do it with confidence. We do alot of this and to jump to the most important pages first and "practice" on them, is not something we recommend. We often think we know, but every site has nuances and customers do not do exactly as we anticipate.  We got burnt a few times doing the important pages first as that is what the client always wants...  You may get it right, but why risk it. It is a ten day delay, if all goes well. Hope this assists.

Honestly speaking, I didn't try Scrapebox for this purpose but I heard that the results are not very accurate. I think you should go with URL Profiler if you're gonna need it on regular basis. Let's see what other suggests. Umar

No probs Patrick. Sometimes it's unavoidable and would depend a lot more on the overall quality / trust of the site in general. When you say devalued, in this case the duplicate content would likely just be ignored - is this what you mean? That's not to say that everyone should go out and duplicate chunks of content - continue to focus heavily on making the content as good as it can possibly be. -Andy