Introduction
Replacing the case is fairly easy, there will be small parts you will be removing so make sure you have a place to put them for safe-keeping.
Tools
Parts
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            Insert the plastic opening tool in between the front case and the back case. 
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            Apply downward pressure to make the case lift upwards, thus popping the front case off. 
 
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            There is a black tab in the top left corner holding the core in place. 
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            Remove the core by pulling straight up to prevent breaking the tab. 
 
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            Pull back on the indicated tab of the white plastic cover to unhook it from the top of the phone. 
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            Using the plastic opening tool, undo the indicated clip on the bottom of the white plastic cover. 
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            Remove the white plastic cover. 
 
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To reassemble your device, put removed pieces into the new back casing, then follow the steps in reverse order.