Excellent guide, smooth install.
I would add a few additional suggestions/clarifications:
* Agreed that 7 & 8 are not necessary but for ease I used a piece of tape to gently hold the speaker assembly up and out of the way.
* I bought a Mobile Phone Toolkit from Radio Shack which I've now used for multiple phone and tablet repairs.
* If the small screwdriver you're using isn't magnetized, rub the tip for a few seconds on a magnet and it will make the screws much easier to remove and re-install.
* The disconnecting of the I/O Assembly is done just like the battery connection in Step 6. Once you lift the black flap, rock the connection back and forth with the spudger to separate. See the 3rd picture on Step 6 to see what the separated connector looks like.