Here’s an idea if you have a large amount of paper that needs to be shredded and have a small shredder that can handle only so much or the motor gets hot if it runs too long. I used this method to destroy old checks when we changed addresses.
Fill a sink up with water and place all the papers in there then wait a few hours they will turn to mush. Stir them around and squeeze them out with your hands, then place them into a plastic bag for the trash. This soaking method takes a lot less time then shredding and completely destroys the confidential information.