The problem with using Google to see how well your own website ranks for search terms is that Google remembers where you have been and ranks sites higher that you have visited before – even putting them at the top when nobody else even sees it on pages 1-4. In other words, your website might not rank as well as you think. To get around this either try searching on someone else’s computer that you haven’t used before, like the ones at the library, or use this free tool to see how well you rank.
ADENDUM: That free tool has been returning a busy signal so you probably won’t get on. Another way to bypass the record Google keeps of your surfing is to use a proxy. A proxy simply makes it look like you’re on someone else’s network other than your own. Actually, it doesn’t just look like you’re on a different network, you actually will be on a different network. You can go here and type in google.com and Google won’t think you’re on your usual computer and thus won’t skew the results in favor of websites you’ve already visited, such as your own. You’ll get a more accurate idea that way of how your site actually ranks.