I've done it. No photos or video, but use iFixit's teardown photos as a reference. It took me about 35 minutes to replace the disk and memory. No cables were disconnecting from logic boards. Mostly taping, screwing/unscrewing, and wiggling. All you need is a T6 and T8 torx driver and a non-metallic spudger.
- Unscrew the base and set it aside, upside down. Use it to hold screws you remove.
- Remove the DDR3 SO-DIMMs. You will need this space later to wiggle out the hard disk.
- Unscrew the exhaust fan (3 screws). Set them aside in the base. You do not need to unplug the exhaust fan's power cable.
- Unscrew the wireless cowling (4 screws) and set those screws aside. You will need to wiggle it considerably, and you may want to emply the use of a non-metallic spudger, but it wiggles loose. You do not need to disconnect the wireless antenna cable. Set the cowling towards the top of the unit.
- Unscrew the black exhaust fan cowling on the left side of the chassis (2 screws). Wiggle it loose then set it aside.
- Use two Torx drivers or a logic board removal tool, and insert them into the two blind holes in the logic board. These will touch nothing but the other side of the chassis. Gently tug both together, until you can pull the logic board out by 1 1/2 to 2 inches.
- You can now wiggle the hard disk drive (which was underneath the wireless cowling) out. You can use a non-metallic spudger to remove the temperature sensor. It should still be sticky enough to attach to the new drive. If not, use a single drop of a gel-based superglue. Remove the SATA cable from the left side of the drive. You'll need to remove 4 strips of electrical tape from the drive, and a plastic covering.
- Follow steps in reverse order. When putting on the wireless cowling, you may need to separate the "ridge" that hugs the chassis a bit with a spudger or a flat screwdriver since it fits very snugly. Also, two of the screws that secure it actually screw into the hard disk. Since the hard disk otherwise floats around freely, you can use a Torx driver to easily realign it as you reassemble.
It's a LOT easier than most people anticipate. Now, replacing the optical drive? That would be a PITA since you have to remove the logic board entirely. But for an HDD replacement there's only 9 screws, 2 cowlings, a memory and the fan to remove (and partially pulling the logic board out 1.5 - 2 inches), plus some re-adhering of electric tape to tidy up cables.
