Step 1: Remove the Trim

Start by taking off the trim using a small pry bar and hammer. Be careful because old wood tends to be brittle and you may want to reuse the trim.

Tip: The best way to remove the nails from the trim is to pull them through the back using pliers. This will preserve the face of the wood.

Step 2: Cut the Sides of the Windowsill

Use a Japanese pull saw to cut each side of the windowsill. Make a cut on each side and one in the middle.

Step 3: Pry out the Pieces

Once the windowsill is cut, pry out the pieces using a small pry bar and hammer. Split the wood with a chisel and hammer if necessary.

Note: The support pieces from the upper cabinet rest on the countertop and will need to be modified. The new countertop is thicker so an extra 1/2" clearance is needed.

Step 4: Nail Stock Into Place

Cut two pieces of 1/2" stock (small) to put on each side of the support. Nail into place using the impulse finish nailer and 1" nails.

Step 5: Create an Extra Clearance

Lay the blade of the pull saw on top of the stock pieces and cut through to the back. This will ensure an extra 1/2" of clearance and a nice clean edge. Knock the pieces out using a pry bar and a hammer.

Step 6: Drill a Starter Hole

Use a drill with a spade bit and drill a starter hole in the countertop. Pick an area that has no supports or obstructions under it and drill the hole.

Step 7: Cut through the Countertop

Using a reciprocating saw cut through the countertop from this starter hole to the front and to the back. Do this in a couple of places.

Step 8: Pry Up the Pieces

Pry up the pieces and remove. Make additional cuts if necessary, but be careful of the supports.