Carve small dots to find the home position for multiple carving sessions and use the lines on the X-CARVE waste-board to keep everything straight. Doing so will make for a near-seamless carve.

I uploaded the artwork for this sign to the Inventables website where you can load it into the Easel program… so you can carve your own version! https://www.inventables.com/projects/carve-a-large-sign-with-the-small-x-carve