ok, first thing you do when you come up to a corner, carry lots of speed in, as you're braking or lifting for the corner, pitch the car a little bit in the opposite direction of the corner, then just before the normal turn in point, flick in back the right direction and into the corner, if you get it right you should have a decent slide started, you can control it a little with the brakes as you release, snap off the the brakes to get more rotation, bleed off slowly to keep the car more composed. as you get to power focus on getting the car straightened out, depending on how much front grip you have and/or FWD RWD or AWD you can either gradually unwind the wheel and free the car up, or be a little more aggressive with the power and try to create understeer which will also straighten the car out, 2nd method works better in FWD and AWD.
do this around every corner, other cars will get scared and move out of your way. the more sketchy and loud you make it the better, you'll get there fast and get style points.