The back of the watch has six rectangular notches around the edge. Using a jeweler's case wrench and 4-pin vise to hold the watch align the three teeth of the watch to three of the notches on the back and turn counter-clockwise. Considering that the tools alone are going to cost you a minimum of $30 - $40, and then you'll have to purchase a battery for $5 - $7, I'm going to recommend that you have the battery professionally replaced for $10 - $15 at your local jeweler. Keep in mind, I'm also considering the fact that you suggested dismantling the watch in order to change the battery. This is obviously an indication that you have no experience in the most basic servicing of a timepiece and to ensure that your timepiece isn't damaged, you really should leave this to a professional.
Watch Back Example and Case Wrench
4-Pin Case Vise
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