The first thing you need to do is settle on the shape of the headboard, then its height. I measured the width of our full-size mattress and added an additional 2″ to each side for nice padding. The guys at Lowes cut the MDF to the height I needed. Don’t throw away the excess. I’ll explain why later.
If you like a standard 90-degree angle headboard, you don’t even need to mess with a jigsaw. However, I had my heart set on those circular cut outs. Simply draw the shape on one of the corners.
Trace it on a piece of paper. Cut it out, flip it so that it’s a mirror image, and trace with a permanent marker on the other side of the board.
Carefully use the jigsaw (ask for help if you’ve never used one) and trace the lines you’ve made. Eyeball it so that the two sides look relatively identical.
Since you’ll be upholstering it, don’t worry if the cut outs aren’t 100% identical. Subtle imperfections will not be visible under the layers of batting and fabric.