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When changing a flat tire on your vehicle there are some easy bits of advice that will make it go faster and safer.
First, while the car is still on the ground break use the lug wrench to break all the nuts loose. The weight of the car will stop the wheel from spinning unlike if it were up in the air. If you're light, like my wife, you might need to jump on the wrench to break the lug nuts free.
Next, position the jack under the car in the manufacturer's recommended position. Typically it will be under the door sill pinch weld and often marked with an arrow. The manufacturer engineered this point to be strong for this exact purpose; any other point could damage the vehicle.
Next, jack the car up until the wheel is clearly off the ground.
Next, use the lug wrench to remove all of the lug nuts.
Once this is done, remove the wheel and slide it under the axle of the car. Do this for your safety. If the jack fails the wheel will stop the car from crashing to the ground and crushing you or from causing serious damage.
Install the new wheel and spin on all the lug nuts finger tight.
With the lug wrench, tighten the lug nuts in a star pattern to ensure proper yield on the bolts.
Finally, lower the car back down, stow the flat/damaged wheel, and stand back with with your head held high.
A couple days later it would be good to check the lug nuts to ensure they're still tight. If you're not sure, pop by any tire shop and they'll happily torque them properly at no charge.
Oh, and "focus on happy"...that's my life mantra.