Wiper arm removal

There is a special tool for this, but it is possible to removing without the tool. It helps if someone is able to show you.

The arm is held onto the post by spring action jamming. If you lift the arm off of the windshield and then push down the portion of the arm that isn't spring loaded while pulling on it up and away from the post, it should slip right off. It may stick, so it could be tricky.