Introduction
Remove the lower case to access the internals of your MacBook Air.
Tools
Parts
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Remove the following ten screws:
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Two 8 mm 5-point Pentalobe screws
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Eight 2.5 mm 5-point Pentalobe screws
 
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Wedge your fingers between the display and the lower case and pull upward to pop the lower case off the Air.
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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.
I recommend that one of the tools you obtain is a jeweler's loupe that mounts on your glasses. It makes things easier.
blairweaver -
This is not correct. You need the pentalobe tool at this point.
Duane Hellums -