cal and David are right... the main thing is to present yourself as a professional, doing professional work. Give a solid bid that you can live with, and don't back down to less, you will definitely regret it. When people "nickle and dime" you, they are treating you like a flea market salesman, but still wanting professional work done.
We had a very similar thread on this in this forum, search for it for links to common rates charged by different types of developers in different areas. It may open your eyes.
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Allen
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http://www.stand318.com