Remove the four identical Phillips 3.4 mm screws from the memory door. These screws have 4 mm diameter heads rather than the 3 mm heads on the body screws.
Remove the three Phillips screws in the battery compartment near the latch. Apple was nice enough to tilt these screws at a slight angle to make them easier to remove. On the A1261 these screws have 4 mm diameter heads rather than the 3 mm heads on the body screws.
Do not yank the upper case off quickly. The case is attached to the logic board via a ribbon cable.
Lift up the back of the case and work your fingers along the sides, freeing the case as you go. Once you have freed the sides, you may need to rock the case up and down to free the front of the upper case.
Disconnect the two antenna cables from the AirPort Extreme card, the iSight and inverter cables from the left side of the logic board, and the display data cable from the right side of the logic board. Be careful to slide the connectors as they may become damaged otherwise.
For A1229 and A1212 models, disconnect the three antenna cables from the AirPort Extreme card and the three connectors highlighted on the logic board.
For the A1229, the order of the cables from left to right is: Black (left; towards the edge of the case) — Grey (middle) — Blue (right; towards the middle of the case.
For the A1261 model, disconnect the two antenna cables from the AirPort Extreme card and the three connectors highlighted on the logic board.
Carefully peel the iSight and inverter cables off the top of the left fan and de-route the AirPort antenna cables from the channel in the left speaker.
Remove the ten silver T6 Torx screws securing the display (five on each side-take note that the inside screws on both sides are longer with a thinner head).
Don't forget to replace the hinge end caps when reinstalling the display assembly. The end caps are side specific, so be sure that the posts are facing towards the lower case.
Now that the right and bottom edges of the rear bezel are slightly separated from the front bezel, use a spudger to pop the rear bezel off the tabs near the lower right corner of the display.
Insert the flat end of a spudger between the front bezel and the plastic strip attached to the rear bezel near the screw holes at the bottom corners of the display.
Rotate your spudger toward the rear bezel to separate it from the front bezel.
If necessary, continue separating the left edge of the rear bezel off the tabs on the front display bezel.