Hopefully, you're already a committed safety glass wearer. Grabbing a pair for even the simplest drilling/driving task is good practice, and a part of your DIY routine. Even better, if you use power tools, you're also protecting your hearing from those roaring 85-90 dB motors.
Last in that great triumvirate, and perhaps the most often overlooked, is protection for your respiratory system. Too many of us don't wear a dust mask, respirator, or sealed face shield when working on projects for one simple reason: they are extremely uncomfortable, a total hassle, and more irritating than your second cousin's toddler at the Thanksgiving table