Help with this proper punctuation and advise on putting some transitional words thanks?

How to change a flat tire is something everyone should know. First make sure you are on a shoulder and free of oncoming traffic. Make sure you turn you hazard lights on. Put the car in park and put the emergency brake on. Locate the jack and spare tire. if you are not sure where to find them, look in your owner's manual. Place a wheel chock or a large rock behind and in front of a wheel. Loosen all of the lug nuts which hold the wheel in place, before jacking up the car. Carefully jack up the car. Refer to your owner's manual again for proper jack placement. Remove the lug nuts and set them aside where you won't loose them. Remove the flat tire and set aside. Put spare tire on studs, making sure the valve stem is facing you. Tighten all lug nuts in a star pattern until fairly tight. Lower the vehicle and finish tightening the wheel.