The professional who admits a limitation has protected the client’s next decision.

Saying that something is outside what you do well feels like losing work, and it is usually the most valuable thing a client hears. Without it, they proceed on an assumption of competence you know to be shaky, and the cost lands later, when it is expensive and their options are fewer. An honest limit lets them choose with accurate information, which is what they were paying for.

Name the edge of your ability before a project starts, in plain terms. Recommend the person who does that part properly. Being trusted is a longer arrangement than being hired once.