How to use a chiropractic adjustment tool?

I'm curious, how exactly does one use a chiropractic adjustment tool? Is it a DIY procedure or does it require the expertise of a trained professional? Are there any specific techniques or methods that should be followed to ensure the best results? Additionally, what are some common precautions or safety measures that should be taken when using such a tool? I'm eager to learn more about this topic and how it can potentially benefit those seeking relief from back pain or other related issues.