Once you cut the pieces for the sides, count the stitches on the pattern for the color you are working with, both across and up & down. Then count the holes on the canvas that correspond to the pattern. Sew the first few stitches, then re-count the pattern and the canvas to be sure you're lined up properly. Counting stitches is VERY important, otherwise you'll come to the end and be off-centered. Be sure that all your stitches go in the same direction (unless otherwise indicated on a pattern).