You should get a wheel alignment for your car every 24 to 36 months. However, to be on the safer side, you need an alignment whenever you notice that your steering wheel is shaking, your car is drifting sideways while you drive, and so on. Also, if you use and maintain your vehicle correctly, it won't have issues quickly. Whenever you want to get an alignment, do not try to do it yourself if you don't have any experience, it's dangerous for you and the passengers; hire a professional, and they will get the work done as soon as possible.