Thanks for all the replies. They've been really helpful

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I have another question, but I didn't really wanna start another thread. Here it is:
Ok so say I want to short a few shares of stock X. I send the order, my broker (Scottrade) "lends" me the shares and then sells them for me and puts the money in my account. Scottrade then charges me their 9% interest or w/e on that "loaned" money until I buy back the shares to cover. Did I get all that right? Is that how shorting works?
Thanks.