How difficult is it to replace just the keyboard? (I see that several folks sell them)
Take a good look at where all the cables and wires are routed in the next couple steps! You might even want to take a few pictures. They must be routed exactly the same way going back together. Either stuff will not fit, or you'll get intermittent video.
I've done several of these without removing the optical drive, etc, and just gone directly to replacing the hinges from here.