On my 2000 it was super easy. There are three bolts on top that go into these holes:
There are six screws at the bottom that attach it to the splash guards. If you remove those, remember how they attached to the clips. It took me a while to figure that out when I was putting it back on.
And lastly, it is bolted onto to the fender in each corner. You don't HAVE to remove the wheel and splash guard for those (I didn't), but it might make it a little bit easier. If you push back the splash guard a bit (each corner), you'll see where they are.
EDIT: Oh, there are also two brackets on the bumper guard that stick into bumper. If you push down on the bumper a little bit (where they are), the brackets come out.