Hi Guys, I am going to remove our old L and P ceiling in our back lounge as it has cracked and some has fallen away. What i wasnt sure of is there any advantage of using 8 x 4 sheets of plaster over smaller ones , the room is 15 ft by 12 , i guess the smaller ones are easier to work with, also what thickness would you recommend, the house is 1913 and not a straight wall in the place ! also what length screws ? ta, finally can i cut the holes for the lighting before having it skimmed over or is it best to wait until the plaster is finished ? Thanks in advance