The best way i have found is to use construction adhesive in small dabs then use a small nailer gun to "tack" the pieces in place. set the nails at a slight angle to help keep the panel snugly in place. set the air pressure for your nail gun percisley by doing this on scrap piece and the wall first, its important the nail gun doesnt go to far into the thin panel. Also very important is that the panels acclimate to the houses humidity. store them in the room for at least 24 hours or longer. Panels can shrink up or expand and ruin the project entirely. also at the seem use the same color electrical tape(as teh seem) behind the seem so when the seasons and humdity change the gaps dont become so obvious. Good luck and most of all plan well and take your time.