That’s so beautiful! So intricate.
I love it; gorgeous!
Boy, this is one gorgeous piece.
I did the same thing ladies.
Hi! LOVELY stitching! You're going to be so pleased with this piece. As to your question, when I did this piece, I used the chart and counted (carefully, several times) the threads and/or stitches between the center motif and the border stitches (just like laurichosvig said). I wanted to be sure the center was centered, and that the border met at all four corners. I'm not sure that simple measuring will get the same results. So, take a deep breath and then put on your counting hat.
I counted the spaces from the edge of the center design, then recounted and counted again.