Using your potter's needle, trim the slab you just created. Although you could make this practically any size or shape you'd like, for your first slab pot I recommend making your base a square of about 2 inches by 2 inches. (This does not have to be a perfect square or perfect measurements. If you can eyeball it, feel free to.)
Slightly smooth the cut edges of your square by lightly tapping each edge on your working surface. Using your potter's needle, score (or scratch) the upper surface of the slab along each edge. Your scoring should be no wider than 1/4 inch and no deeper than 1/16 inch deep.
