it actually is easy, you just choose to short and your broker does all of the technical steps to make it happen and when you want to close the position you just tell your broker to do so. in reality shorting is no different than going long, you are just selling and then buying the stock rather than buying and then selling as is typical. however, it is easy to grasp that you can loose money you invest where as with shorting you can loose money you don't have!
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