OK,
I just did this on a Timex wristband, it is not easy. I couldn't find any step by step instructions on the web, but I did find this illustration of how an expandable band is constructed. From this illustration I was able to figure out how to take out a few links and put the whole mess back together again. Here is the image-
http://www.freepatentsonline.com/6442970-0-display.jpg
This comes from a patent page, you can read all about the patent here-
http://www.freepatentsonline.com/6442970.html
The essence is that you have to remove a cover from the top of the link, then you can remove what look like little staples (a small, square ended "U" shape pin, the "U" turned on its side) from each side. The illustration shows a cap on just the top piece, the band I worked on had caps on both the top and bottom, once these were removed I could get to the "U" shaped pins, then the band can be separated. An alternative is to pry back the ends of the caps to allow you to remove these "U" shaped pins.
Once you see the illustration, at least you will have an idea of how the band is held together.
For you older folks out there (like me), a good hands free magnifying glass is a neccessity. In addition, a good set of precision screwdrivers, a pair of tweezers and a utility knife with a brand new blade were included in the tools I used to complete this task. Also, patience is a must, if you frustrate easily, take the watch to the jewelers!
The watch I worked on (my moms) turned out perfectly, but I'm in no hurry to do another!
Hope this helps someone.
Melvin Fields, August 2007