Even if you have the harnesses in hand, they're not exactly plug and play. Pulling your dash apart to find one 26 guage wire for the VSS in the instrument panel harness takes balls, if you don't feel comfortable with messing with electronics. Cut that wire while your splicing it, and you're speedo/odo quits working.
I've built the harnesses in the past as favors for several members, but even then, it's a one to two hour job to install them. Only one end of one harness has a connector. The rest are terminals that you have to properly plug into the correct pin locations on the correct connectors on three electronics boxes. Also, you need to track down five terminal pins from your dealer and crimp them on, yourself. I've had limited success getting these terminals in the past.
If you don't feel comfortable with not having a 'plug and play' harness that simply snaps in place, I wouldn't recommend that you mess with this. It's not all that, IMHO, and other than to test it out, I don't use either function (audible directions or voice commands). Regardless of actually making or buying the harnesses (they're not that hard to make), read the link that I posted carefully to see if you feel comfortable with the install. If you do, and want to forge ahead using the instructions posted on the FAQ, the next step is to become a supporting member of the forum and donating to the FAQ. Most of us learn valuable information that's worth much more than the cost of membership.
If you haven't already, you should also go to the Nav Swap writeup (in my first reply above) that shows how to retrofit the Nav in a non-nav car. This is where the VSS wire splice is explained. If you succeed in that, tackling phase 2 would be the next step, or you can stop and still have a functioning Nav.