Start with your first piece: groove facing the wall, tongue facing out. Use the framing gun to add a nail to the tongue of the plank and secure in place. For the next piece, you will connect the groove of the new piece into the tongue of the first piece.
Secure the planks by attaching a tapping block to the tongue and lightly hitting it with a hammer into the seam.
NOTE: Never hit the tongue directly with a hammer, or it will no longer interlock with other pieces adequately.
When you approach the holes in the ceiling for recessed lighting, be sure to accurately measure the location for the center of the light (Image 1). Continue planking the ceiling, then go back and cut a hole for the light using a 6-1/4” hole saw (Image 2).