Putting air in tires is a relatively simple process that you can do yourself. Here's a step-by-step tutorial on how to put air in tires:

1. Find a suitable air source: Look for a gas station with an air pump or have a portable air compressor or tire inflator ready. Make sure the air source provides accurate pressure readings.
2. Prepare the necessary tools: You will need a tire pressure gauge to check the current pressure and a valve cap removal tool (if required). Some air pumps have built-in pressure gauges, but it's recommended to have a separate tire pressure gauge for accurate readings.
3. Check the recommended tire pressure: Locate the recommended tire pressure for your vehicle. This information is typically found in the owner's manual, on a sticker inside the driver's door jamb, or on the sidewall of the tire. The recommended pressure is measured in PSI (pounds per square inch).
4. Remove the valve cap: Unscrew the valve cap by turning it counterclockwise and set it aside in a safe place. Some valve caps have a built-in tool for valve core removal, but most can be removed by hand.
5. Check the current tire pressure: Use a tire pressure gauge to measure the current pressure. Press the gauge's nozzle firmly onto the valve stem until you hear a hissing sound, indicating that the air pressure is flowing into the gauge. The gauge will display the current pressure reading.
6. Inflate the tire: Attach the air pump nozzle securely to the valve stem. Ensure a tight seal to prevent air leakage. If using a gas station air pump, activate the machine by following the instructions provided. If using a portable air compressor or tire inflator, connect it to a power source and turn it on.
7. Add air to the tire: Monitor the pressure while inflating the tire. If using an air pump with a built-in gauge, observe the pressure reading on the gauge. If using a separate tire pressure gauge, periodically release the air pump nozzle and check the pressure by firmly pressing the gauge onto the valve stem. Add air in short bursts to prevent overinflation.
8. Check the pressure and adjust as needed: Periodically check the pressure during the inflation process to ensure it matches the recommended pressure for your vehicle. Release some air if the pressure exceeds the recommended level. If it's below the recommended level, continue adding air until the desired pressure is reached.
9. Recap the valve stem: Once the tire is inflated to the correct pressure, remove the air pump nozzle from the valve stem. Immediately place the valve cap back onto the stem and tighten it by turning it clockwise. This helps protect the valve from dirt and debris.
10. Repeat for other tires: Follow the same process for each tire on your vehicle, including the spare tire. Check and adjust the pressure in all tires to ensure they are properly inflated.
11. Double-check the pressure: After inflating all the tires, use the tire pressure gauge once again to verify that the pressure matches the recommended level. Adjust as needed to achieve the proper pressure.

Remember, maintaining proper tire pressure is essential for safe driving, fuel efficiency, and prolonging the life of your tires. It is recommended to check your tire pressure regularly and adjust as needed, especially before long trips or during significant temperature changes.

If you encounter any difficulties or have specific questions, it's advisable to consult the owner's manual of your vehicle or seek assistance from a professional at an automotive service center.