Unless your blade is ripped you may not have to change it. When I bought my '84 GLI new the salesman showed me a wiper trick I have used for 30 years. Take a cotton cloth and spray glass cleaner on it, small spot the size of a quarter. Now take the cloth and grab one end of the blade squeegee which touches the glass. Pinch that contact edge with the cloth/cleaner and draw slowly toward you cleaning, removing and "sharpening" the contact edge. You can feel a bit of grit, bug and contaminent, the cloth will show two black marks. Select a new clean area of cloth, spray and repeat a couple of times. The secret is pinching the edge which touches the glass.
You are in effect cutting a new wiper blade edge and renewing your blade(s). I may do this 3-4 times a year. I get 35-50k miles (~1-1.5 yrs) from my blades in 4 season mid Atlantic weather. Try it, you'll like it, John