The first step to replacing your windshield wipers is getting the old worn out wipers off. Be careful when removing them, the wiper arm is metal and your windshield is glass. One clumsy move and you could scratch or crack the windshield - not good.
To remove the old wiper, pull the entire assembly away from the windshield, it will prop itself in the raised position. With one hand holding the wiper arm, use your other hand to depress the small tab on the underside of the wiper where it meets the metal arm. With the tab depressed you can slide the wiper off the arm by pulling the center toward the bottom of the wiper arm.