This was supposed to be simple and fast, and I need to head to the beach tomorrow. Replacing a 25 X 22 composite kitchen top-mount sink on granite. Changing to a Kohler 25 x 22 stainless drop-in. The granite seam cut bisects the sink opening. Anyway, the existing cut turned out to be biggest trapezoidal, too-narrow-for-clips hack job of a cut, which explains why they never used them in the first place. If I tent/isolate this kitchen and grind it, how crack-prone is trimming back the areas behind and in front of the sink cut? (I need space for clips to pull this SS sink down snug.) Thanks much.