If you have a flat tire while driving your car, come to a stop as quickly as you can. Pull to the side of the road as far as you can without tilting the vehicle. Better yet, get off the road entirely if it’s just a few feet to get there. Be certain you are on a level area or forget the idea altogether. Put your car in gear or in park, engage emergency brake, and turn on hazard flashers. Pop the trunk if you can do so remotely (this helps passing cars to see that you are stopped). Carefully watch traffic at all times, especially as you exit the vehicle. If you have flares, lights, or cones, now is the time to set them out behind your car.
Remove the jack and spare tire from the trunk. Using the flat end of your tire iron, pop off the hubcap if there is one. Set your spare upright against the car, near your flat but aside. Now you must “break” each lug, before you do any jacking. Place the wrench onto the lugs one by one, and just barely loosen them – all you are doing is making them easier to remove later, so do not try to remove them yet. Just a slight break is all you are after for now. Watch for traffic.