The install is not really that bad IMO.
Yes if you want to use the high speed you cant just use any relay. Nor can you get away with using a starting solenoid. I tried doing it with a solenoid at first and it worked great... but they are not made for continuous duty. So if you left the high speed on for more then say 15-25 minutes, the high speed would no longer work because the solenoid gets to hot. I picked up an actual relay that looks exactly like the solenoid that i used... its rated for continuous duty. I have not had any problems with the high speed since.
Here is the relay i purchased:
http://bpi.ebasicpower.com/pc/ARCR012/ALLRELAYS/Relay%2C+12V%2C+85+Amp
Other then that, i was skeptical about cutting the mounting bracket for the mechanical fan (you HAVE to do it or else the Taurus fan wont fit). But after i got the bearing out of the bracket, cutting it was no big deal.
Follow the link i gave in the first post i made in this thread... its pretty self explanatory.
Oh about the Taurus fan... you can get them from the 3.8L version of the Taurus from something like 89-95. You can also get it from a Lincoln Mark VIII with the same engine / year.
Watch out for these fans on eBay... if its a "replacement" fan for these years it is NOT the same thing. They are not rated for the same amount of CFM's as the originals. I would make sure that it was pulled from a junkyard vehicle, or go pull it yourself so you get the right one. If you just get the replacement, your defeating the purpose.