Set a cedar block on a level surface.
Place the top edge of the froe blade -- with the handle facing up -- on top of the cedar block. Move the froe until the blade sits roughly 1/2 inch from one edge of the block.
Hold the froe handle at vertical with your non-dominant hand. Adjust the handle so that the blade is perpendicular to the top face of the cedar block.
Tap the top of the froe blade with a mallet; drive it into the top of the cedar block. Continue tapping the froe until the blade sits completely in the block. Twist the handle -- held with your non-dominant hand -- until a shake splits from the block. Force the blade further into the block if the shake does not split when the handle is turned.
Move the froe in another 1/2 inch, and repeat the process.