There is more involved than just replacing the Brake Pads. You will need to turn/replace the rotors and make sure everything is in good shape. If you need to ask how to do this job, then for your safety have the job done by a shop so it is done right. At least get someone who knows how to do the job right help you for the first time.

Knowing the Blood and Lifeline of Your Car’s System - Brake, Power Steering, Battery and Radiator Coolant Fluids