Open the image, and then select Image->Image Size. Your document size might be labeled in inches, which would be nice cos then you'd know about how large it will wind up. A little link icon should show up (IIR PS6) linking the height and width, so that when you change one, the other will change in proportion. If the link doesn't appear, click the Constrain Proportions button. Size it to what you need, click OK, and you're done. Print it.
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