Setting out for 45 deg diamond is just as easy as setting out for 90 deg sqaure...
establish your centre marks on the floor and work from these...unlike working in sqaure where you can alter your starting point..i.e. full tile to line or centre tile to line to get a decent size cut with 45 diamond it doesnt matter because if you start full tile or centre still gives the same size cut but just next row along if you get my drift....hope this helps ......dave...
also to keep your tiling running true to your line keep the points of the tiles on the line....
will give you some advice but our setting out methods are different from the "old school" methods. find a straight line (longest wall) work off that and keep the tips of the tile on the line.