Car care goes a long way to keeping your car in good shape. Maintaining your tyre pressures can be done by even the biggest car dummy. As time passes, your car's tyre pressure may go down and cause the tyre to be under-inflated. A few problems may arise. First, under-inflation leads to a larger (than needed) contact area between the road and tyre. This produces excess drag and thus, higher fuel consumption. Another problem which is more prominent on older cars is that you'll start to feel that the steering becomes more heavy; but this isn't a very noticeable trait. So yes, a regular check up on your tyres could save you a lot on money in the long run. How regular? Experts suggest at least one month. Putting too much air isn't good too! Over-inflation may cause the ride of your car to feel more 'crashy' and in the long run gives your tyres excessive wear and suspension problems. So fill them just right!
Now already know the why. Here comes the How?. First off you need to know how much pressure you should be putting in your tyres. Open your drivers door and look for a placard that's similar to the picture above. All the numbers and figures look daunting, I know because I have a sister to explain this to. kPa and psi are units of measurement, something that you'll have to keep in mind when you're at the pumping station. As you can see each row corresponds to your usual usage of the car. If you usually drive alone, best to choose the first row of pressures. Change the pressures when you bring your mates for the next road trip. Now you know how much to put, you're pretty much ready.
When you're at the pump, first choose the correct unit of measurement, then select the correct pressure. Once that's done, unscrew the cap and press the nozzle in. You'll start to feel air rushing into your tyres and you'll usually hear a beep from the machine to know when its done. And there you go! Three more wheels to go :)
It may be tedious for some, but its a cost-effective way of maintaining your car, and one thing that I think every driver should know how to do.