There is no need to study mechanical engineering to replace the wiper blades. The metal arm detaches from the bonnet and is attached to the vehicle and attached to your vehicle. It is a piece of plastic with a metal blade on it, and it is about the size of the wiper blade.
A good rule of thumb is to replace the wiper blades every 6 months, especially in humid climates. The metal blade holds the rubber blade, which you need not worry about as long as you check and replace your windshield wipers for normal wear and tear. It is a safe bet that you can replace them every 2-3 years for a total of 3-4 years.
If the wiper blades leave residual water or dirt on the windscreen after wiping, they should be worked out. If they make shaky movements or screeching noises as they glide quietly through the windshield, it's time for a new set.
This can be tested by spraying windshield washer fluid and watching the wiper arm clean the windows. If the wiper blades leave streaks or a squeak, you probably need a new wiper blade. Typically, you get a replacement for your windshield wipers and blades in a car parts shop.
It is best to replace them to save on bloated labor costs, but there are cheaper parts, and you can even have them at a cheaper price.
Find out what type of wiper change you need and how to remove it below, and check the size of the wipers and blades required. As with any mechanical blade, the left and right blades may not have the same length.
True, the less you spend on the wiper blades, the more they wear out, but everyone seems to have a sweet spot in between on this issue. If you live in a cold climate, you should consider winter blades because they have an additional casing to protect the leaves from the accumulation of ice and snow. Most blade assemblies are supplied with an adapter and therefore fit into the arms of most makes and vehicle models.
Before removing the old wiper blades, make sure the wiper arm is in position and press the release mechanism of your old wipers. Pull or slide it out of your arm, push and push it with your arms, then push and pull it back into your arms.