Double clutching is when you press the clutch pedal twice while changing gears: once while you shift into neutral, and a second time while you put the shifter in the new gear. Why would you want to do that with your manual transmission car?
LEARN HOW TO DRIVE A STICK SHIFT WITHOUT A STICK SHIFT CAR
You can’t learn to drive a stick shift if you don’t have a stick shift car to learn on. But you can’t have a stick shift car unless if you know how to drive one. It’s a vicious circle! Ok, not really.