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First you need to determine if the watch is a snap back type or a screw back. If the watch back has a series of equally spaced slots (usually about 6) around it's perimeter, then it is a screw back and you will need a special tool in most cases. You can sometimes remove a screw back using a pair of snipe nose pliers in two of the slots, but unless the watch can be mounted safely in a small vice then this is quite difficult.
The back from snap back watches can be removed with a blunt pen knife. If you look carefully around the edge of the watch casing you should see a small indent in the cover. This is where you start with the blunt pen knife, working your way around the edge twisting the knife gently as you go. Eventually the back will snap out of the watch casing
Just click below for more information;
http://www.pmwf.com/Watches/WatchSchool/WS%2011%20How%20to%20remove%20and%20replace%20a%20watch%20movement/WS%2011%20How%20to%20remove%20and%20replace%20a%20movt.htm
a youtube video guide sample on how to;
http://www.youtube.com/watch?v=ZMLZNclIcME&feature=related
Hope this may help you;
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VOTIT
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