Step 5: Create Shelves/Tenons
2. Cut your tenons. Next you will create your tenons, the second part of the mortise/tenon method. The tenons will fit through the slots on your bookcase sides. The most important thing to remember here is to cut inside the lines, as explained in the last step. Cut an L-shape out of the sides of your shelf ends. First from the sides, then from the top.
3. Repeat 15 more times. You're gonna be at this for a while. Might as well have a drink handy.