The easy and best way is to use sheets as big as possible with countersunk screws.If near a wall then fix a 1 inch by 1/2 inch batten to the wall as long as convenient about 1 inch below the ceiling.Then lift up the board and put the edge over the batten. With that end held by the batten lift and position the other end ,line up and secure.A lightweight jack is also available (or 2) to hold the board while it is secured with screws. You must get organised before you start.
