Introduction
Remove the lower case to access most of your MacBook Pro's internals.
Tools
Parts
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Remove the following ten screws securing the lower case to the upper case:
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Seven 3 mm Phillips screws.
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Three 13.5 mm Phillips screws.
 
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Using both hands, lift the lower case near the vent to pop it off two clips securing it to the upper case.
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Remove the lower case and set it aside.
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.
May be helpful to have more distinct colors to identify the different screws.
Victor Caamano -