Scribe the Irregular Contour onto the Trim

What happens here

With the trim piece securely positioned, take a pencil (or a dedicated scribe tool) and run it along the edge of the trim that is against the uneven wall or ceiling. It's crucial to maintain a consistent distance between the pencil tip and the body of the trim piece. The pencil will transfer the exact, irregular contour of the wall onto the trim piece, creating a precise line that needs to be followed for cutting.

Goal: Transfer the exact shape of the uneven wall/ceiling onto the trim piece.