The best way to lay a herring bone is to 1st make sure the frame is square. Take diagonal measurements, of the opposing corners if they are the same the deck will be square. 2nd block your framing for the border and the seam board. 3rd deck it diagonaly both ways, snap lines for ther seam bord and cut it. Lay the seam bords in place. Cut the ends for the border and lay them in. This will save you a lot of time having to cut each individual deck bord.
Make sure when you lay down the 1st daigonal deck board that it is down @ a 45 degree angle. This can be determined be equal Amount of inches over is the same as up. 2 equal #'s on a square are a 45 degree angle. Also Heriingbones are best laid if you start in the middle of the deck and work both ways, this will reduce the chance of the anles not being the same if you make a mistake in the layout.