Step 3 · Dry Fit and Temporarily Support the Sink
Place two 2x4 boards across the top of the sink cutout in the countertop. Position the sink underneath the counter and have a helper lift it up into position. While they hold it, use one or two bar clamps to secure the sink loosely to the 2x4s, passing the clamp shaft up through the drain hole. Before fully tightening, double-check the sink's alignment with the countertop reveal on all sides. Make any necessary adjustments, then tighten the clamps to hold the sink firmly in position for the next steps. This support system will hold the weight while the sealant cures and you install the permanent clips.