Changing the front and rear windshield wiper is very easy and you do not need to bring it to your mechanic to do that. The mechanic will charge you for the cost price of the wipers and then charge another $20 or $30 labour charge. Instead you could do it all by yourself and save on those labour charge fees.
All you have to do is to simply pull your wiper out of the hooks it is attached to. Usually it involves pressing on some lever in the centre and then the wiper pops out easily. Then you can slide in your new windshield wiper until it clicks and locks into place.