Dress with Safety in Mind
The thing about DIY accidents is that it's often the small things that end up hurting you. You know to be careful around electricity, saws, riding lawnmowers and other obviously dangerous stuff, but what about your jewelry or long sleeves? If you're around anything that spins (like a saw) dangling sleeves, jewelry and even long hair can get caught up and pull you toward danger.
Wearing shorts or going barefoot in areas where things get hot or break can also cause problems. The lesson here is to dress for the task and take your wardrobe seriously.