I just did this last night on my 06 sti and it was slightly different than the posted directions.
the yellow circle shows where the bottom half is attached to the steering column.. the red circles are the 2 screw that hold the top half to the steering column.
remove them and you can lift the top half up; which makes it a hellova lot easier to remove the ring.
as stated earlier, the wire is reallllly short, and wrapped around another. its the green pair of wires, and after you remove the bulb from the ring, you can untangle it from the other connector, makes it a little easier to get around.
Hope this helps