Place the watermelon with the yellow spot, if any, on the bottom and out of view. Be sure it is in a stable position so it will not roll.
Measure the diameter of the watermelon.
Find the center and add 1/2 inch.
Using a non-toxic marker, mark a line horizontally around the watermelon so you can slice off the top evenly.
Before cutting, you will need to trace the handle. See next step.