Oh, dur, it was in your original post. =(
Unfortunately, it doesn't look like they have any repair manuals available on Sony's site (another point for Dell
so I don't know exactly what the installation procedure is for them.
With some laptops you have to take them almost completely apart to find where the ribbon cable goes. I remember replacing the keyboard on IBM ThinkPads to be quite a bear, for example. You might have to remove the bottom in order to get around the (what looks to be a) metal plate.
If you can upload better quality pictures (or even ones with better lighting) that would help out a lot.