When you go to reverse the steps it can be tricky putting the keyboard back. I turned the assembly over to be able to get to the tabs from the back side. Also make sure that you thread the backlight ribbon cable through the frame.
On my iMac (20" intel core duo Model A1207) this was not a "connector" rather it was four separate (loose) wires! So I did not remove them for fear of reconnecting them in the wrong order. Instead I first loosened the drive bracket and removed its cables, then I pryed the thermal sensor from the side of the drive.
I fully agree with urdus. Step 11 is un-needed when replacing the harddrive.