*Note: At any time while editing your document, you can press Control + C simultaneously to bring up the print dialog box. Learn to implement it and it will save you a bit of time.
Word 2010: Select 'print' from the 'file' menu. When the 'print properties' page appears, click the second drop-down button below 'settings.' The top option should be 'print one sided.'
Word 2007: Click the 'Office' button at the top left-hand corner of the screen and select 'print.' Click the 'properties' button at the top right-hand side of the print dialog box. When the properties box appears, select the 'finishing' tab and uncheck 'print on both sides.'
Word 2003: Click the 'file' menu at the top left-hand corner of the screen and select 'print.' When the print box appears, click the 'print properties' button at the top right-hand side of the print dialog box. When the next box appears, make sure you are on the 'layout' tab, then, look for a selection in the middle of the box which reads, 'print on both sides' and select the 'none' option below it.