To execute this easy project, begin by measuring your designated wall width and height to calculate the exact count of interlocking shiplap boards required for full coverage. Locate the internal wall studs using an electronic stud finder, marking their vertical center points lightly with a pencil along the baseboard line to ensure strong anchor points. Install the boards starting from the bottom of the wall, securing each plank into the studs using a brad nailer and construction adhesive to guarantee absolute stability over time. Fill all exposed nail holes with professional wood filler, sanding the dry putty completely smooth using a fine-grit sanding block. Apply a high-quality stain-blocking primer over the raw wood planks, followed by two coats of durable matte interior paint in your chosen charcoal shade.