To replace or change a tire, it is important to Park the car on a flat area and put a jack, tire iron and spare tire together (where necessary). Find jacking points of your vehicle and place jack respectively. In case of trim caps on the lug nuts, remove them as necessary and in case there is a wheel cover or hub cap, loosen it with the tire iron. Turn on the parking brake and lock the opposite wheel that is at right angles with chocks that can either be bought or made out of wood. With an automatic-transmission car, turn the selection to Park; with a manual one, to Reverse. Having loosened the lug nuts with the tire iron on the ground, place the tires onto the ground. When stuck nuts do not budge, a few hard blows of the hammer on the bolt may assist. After the loosening, lift the vehicle using jack and hold it using jackstands. Take out the lug wrench and the wheel and tire assembly. Before attaching the new tire and wheel assembly, make sure that the mating surfaces are clean and without rust before tightening the lug nuts by hand. Lock all the lug nuts in a crisscross fashion until it fits tight and then lift the vehicle lifting off the jackstands and dropping down. Tighten the lug nuts with a torque wrench to 87 ft. lbs. in a crisscross pattern with care not to over tighten. Assuming it is applicable, install the wheel cover/hub cap, making sure that the valve stem is correctly seated and fit the lug nut trim caps. Lastly, put back jack and tire iron, take away the wheel chucks and in case a flat tire was taken off; put it back in the storage section to repair it. Check tires to ensure that there are no tears or punctures or tire treads and check wheel assemblies to be sure that they are not worn or tired and make appropriate repairs or replacement.