How to shave cat matted fur?

Excuse me, but could you elaborate on the proper technique for shaving matted fur off of a cat? I've heard that it can be quite a delicate process and I'm not sure where to start. Should I use a specific type of clipper or blade? Do I need to be cautious of any potential risks or hazards? And what steps should I take to ensure that my cat remains calm and relaxed throughout the process? I'd really appreciate any advice or guidance you can provide on this matter.