there is a link in the how too. and if you are changing the rotors, you will want to change the pads as well. so you will have to push the piston back in. its not that hard, just take your time when you do it and you will be okay. yeah you should always bleed just to make sure there is no air in the system. think safety. there is a how-to in the how-to section. but after you replace the brakes make a serious of 10-12 stops from 70mph to 10mph wihtout coming to a complete stop. then drive for as long as you can without using the brakes. good luck man.