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Here is a video made by Olivia Munn from Attack of the Show http://www.youtube.com/watch?v=Po2lGo7LIPM There are also directions at http://www.breastcancer.org/symptoms/testing/types/selfexam/bsesteps.jsp
Good Luck!!
use the palm of your hand and press around your boob (like a massage) and check for any lumps