First off they do make a tool for this, but I've always used a screwdriver. Where the wiper arm attaches to the wiper transmission, pull the arm back, and look at where the arm meets the transmission and you will be able to see a little tab sticking down. With the screwdriver, push the tab in and at the same time, try to pry the arm up. Try working the arm back and forth, working it off a little at a time. Take you time and be careful not to scratch the paint. This can be a pain in the neck. For added insurance, put down some towels, or a blanket.
[This message has been edited by bruce69camaro (edited 01-29-2002).]