The initial turn may be a little stiff, so just take a pair of pliers or wear some gloves to force it open. After this the lever will be easier and smoother to maneuver in successive turns. Additionally, the ball-valve design will allow the valve to self-lubricate from draining oil, making it a lot easier on your finger when opening/closing. Make sure that when you close the lever; push it all the way back into its locked position.