You?ll need new wiper blades after about six months or a year of use. You might probably tend to go a little longer before asking your mechanic or family members to change them. Wiper blade setup differs quite a bit from car to car, so you may have to follow a few different steps according to your owner?s manual. Basically, the process is similar to changing your air filter: Lift the blades, as if you were washing your windshield by hand, and remove the old blades. Pay attention to how the old blades connect to the metal arms. On most models, you?ll see a tab on the underside of the wiper. Push the tab to remove the old blade. Attach the new blades, being careful not to bend the wiper arms or scratch your windshield. Line everything up and make sure the new ones are secure and tight. If you get distracted or just can?t remember exactly how the new blades should fit on the wiper arm, don?t worry. The packaging for the new blades should have a general set of instructions and a helpful diagram.