Do keep a fire extinguisher and first aid kit handy.Do wear safety glasses or safety goggles when cutting, drilling, grinding or prying. If you wear glasses for the sake of vision, wear safety goggles over your regular glasses.Do shield your eyes whenever you work around the battery. Batteries contain sulfuric acid. In case of contact with the eyes or skin, flush the area with water or a mixture of water and baking soda, then get medical attention immediately.Do use safety stands for any under-truck service. Jacks are for raising vehicles; jackstands are for making sure the vehicle stays raised until you want it to come down. Whenever the vehicle is raised, block the wheels remaining on the ground and set the parking brake.Do use adequate ventilation when working with chemicals. Asbestos dust from some worn brake linings can cause cancer.Do disconnect the negative battery cable when working on the vehicle.Do follow manufacturer's directions whenever working with potentially hazardous materials. Both brake fluid and most types of antifreeze are poisonous if taken internally.Do properly maintain your tools. Loose hammerheads, mushroomed punches and chisels, frayed or poorly grounded electrical cords, excessively worn screwdrivers, spread wrenches (open end), cracked sockets, slipping ratchets, or faulty droplight sockets can cause accidents.Do use the proper size and type of tool for the job.Do, when possible, pull on a wrench handle rather than push on it, and adjust your stance to prevent a fall.Do be sure that adjustable wrenches are tight on the nut or bolt and pulled so the force is on the fixed jaw.Do select a wrench or socket that fits the nut or bolt. The wrench or socket should sit straight, not cocked.Do strike squarely with a hammer. Avoid glancing blows.Do set the parking brake and block the wheels if work requires that the engine be running.