DIY web site Instructables thinks your thumbs are too precious to sit in the path of your clumsy hammer, detailing how to repurpose an old mouse pad as a nail holder. It’s a pretty simple idea (in essence, the mouse pad just holds the nail for you, though I think I’d double over the mouse pad to ensure a better hold of the nail), but if you aren’t a wiz with the hammer, it might save you a black and blue fingernail or two.