If you already have a lot of muscle, pretty quickly. Right now I have pretty solid 6 pack, the progress in cutting I've made since my current pictures is ridiculous. I've been eating the dirtiest...
Keep your rep scheme normal if you want to continue to build muscle, but if you want to lose fat all you need to do is just eat less calories than your maintenance. It's that simple.
The biggest person will not be the one who lifts the most weight, but who has increased their weights the most. (you probably won't believe me... but I assure you its true)