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How imprtant is it to implement a redirect from the non www version of my site to the www. version.
I have specified my preference for www. in google site tools, is this enough or should i use a redirect code? Will it boost my rankings at all?
Is the code easy to implemet?
To go the other way I doubt if it will be much of an issue. As you don't sound comfortable with editing .htaccess set it in WMT and stop worrying.
Google and other SE's will try to figure out if there are duplicate URL issues, your step of using google tools removes an element of doubt for Googlebot. The bots/filters are fairly smart and will come across this kind of duplication often.
One of the main reasons to remove doubt/duplicate URLs/content is for links coming in which'll increase the prominence of your pages. It's generally better all round to not have duplicate URLs pointing to the same resource.