First thing I do is take regular scissors and cut the full countersheets into two half-sheets.
Then I use the scissors again to make a small diagonal cut where the rows of counters end,just missing the corner of the counters on the end of each strip. This helps to weaken the cardboard allowing easier removal of counter strips,and sometimes the individual counters start falling off,depending on how deep the printer's die-cut is.
Last I use a #3 surgical scalpel (didn't know Paul Weir,or anyone else besides me,used this) to cut the cardboard from any remaining counter strips,and to cut apart each individual counter and clip the corners. Like Paul suggested use light strokes to prevent blade wear and slippage.
