If your triangles are perfect, then you should be all set. If you are not sure, then double check the measurements and make sure they are all square, the same size, and that the seam winds up perfectly in the 2 opposite corners.
Remember when you sew the 2 HSTs together, the point of the new triangle is going to be 1/4" away from the edge, not right at the edge.
here is one (of many) tutorials. It has a good picture of how the 2HSTs should look when sewn together with the point a quarter inch from the edge:
http://www.craftsy.com/blog/2014/12/easy-chevron-quilt/