When handling freshly printed carbonless stock, you can quickly and effeciently separate the printed sets with this simple technique.
The last sheet of a carbonless set is not coated, nor it the top of the first sheet, and, as a result, there is much less friction between these sheets than those that 'are' coated within the set.
To separate a managable stack of printed NCR sets from your pile, lift/separate the corner sheets at one one side with your left hand while pressing down on the 'opposite top corner' with your other hand.
Then twist/spin the upper portion of the pile and the printed sets will automatically separate at the bottom and top sheets at a mating set.