If you turn your watch on it's side you will notice little nails or screws holding your links together. You need to push these out on the links you want to remove. A special tool is needed to do this...
Unfortunately, no. The results of the fusion are what you'll have to live with.
Incorrect. I had a 4 corner fusion, and 2 years later, due to a failure of my remaining wrist joint, had a total wrist...