Lay the first 1-by-10 inch board against the wall vertically, starting in a corner.
Secure the board with two 1 1/4-inch nails every 16 to 24 inches across the width of the board. You might need a ladder to reach the top. The boards can cover the full height of the wall or just half. You might need to have boards cut to fit the exact dimensions of the wall if you're trying to cover the entire surface from floor to ceiling.
Once you reach a corner, you can have the board cut to fit, or use a batten, if it will fit.
Measure a 1/4- to 1/2-inch gap between the boards as you secure the remaining boards on the interior wall. This gap is left for the battens to cover.
Place the 1-by-3-inch battens over the gap so they're centered, and secure them with a single 1 3/4-inch nail every 12 inches down the length of the batten. The nails should be driven through the center of the batten.