edge a little along the cut, and stab it in vertically again. you must lift the leading corner of the cutting edge clear of the groove in order to not plow up the wood.
3. if you keep doing this, you will shift the cutting edge of the blade around in a complete circle, and you will need to adjust your fingers to cope! at one point you will need to flip the blade hand smoothly around so that instead of the blade being supported by the tip of the middle finger, it now nestles on the back of the finger in the groove between the nail and first joint. both 