I have a first generation Macbook. About 2 years ago, the wireless card stopped working, so I purchased an external adapter that I had been using. But then, a few weeks ago, the fan broke, and I decided to try to replace it. Since I was delving into my Macbook anyway, I decided to take the opportunity to also replace the airport card.
The repair took about an hour and went reasonably smoothly. Some of the tape that I was not supposed to rip disintegrated when I touched it, but I have not noticed any repercussions. The new fan and the new Airport card both work.
I don't have too much advice, except that the pictures and the words don't match up for the last few steps of the fan replacement guide. Follow the pictures, not the words.
Phillips #00 Screwdriver
MacBook 802.11n Airport Extreme Card