Originally Posted by ChrisSlicks

The easiest way in this car and most modern cars: brake with your foot mostly on the right hand side of the brake pedal, then while still applying pressure to the brakes, roll the ankle so the side of your foot blips the throttle as you down shift.

The hard part is 2 things (that will take lots of practice), keeping the brake pressure even, and getting the correct target RPM. The latter isn't critical, but the closer you are the smoother it will be. Also your clutch action will be much faster, you can essentially treat the clutch as an on-off switch.

Practice by coming down sequentially through the gears while braking from moderate speed, and once you've mastered that you can try skipping gears.

You can also practice your throttle modulation by downshifting while travelling at constant speed, e.g. cruise along at 55-60 and do a blip downshift from 5th to 4th and from 4th to 3rd. Once you get it right it should feel completely smooth and seamless.