I just had to do this for my 2001 Odyssey, and I'd bet it's a similar process. First, open the rear hatch and remove the two black nuts at the far left and right of the top of the door. To access the other two nuts you need to pry the interior trim from the rear window. I was able to pry it off with my bare hands and didn't break any of the plastic clips (even though it's freezing here right now). The remaining nuts should now be exposed; remove them, and the spoiler is now free of the hatch. The last step is a minor one... You just need to unclip the wire for the third brake light from the left side of the hatch. Good luck!