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.