Clutchless shifting is best learned on an unsynchronized 13 speed. Then doing it properly on any transmission is a breeze.
Car transmissions don't lend themselves too well to clutchless shifting. The more rotating mass in there, the better it works.
If you ask someone that drives a heavy truck how often they use the clutch, you will often hear "Once when I start, and once when I stop".
And downshifting has it's proper uses. Dropping it into second at 40 MPH because it "makes the car sound badasser" is NOT one of them.