take a little bigger or smaller seam to adjust for that. finish sewing on your binding.
i like to trim off the bulk in the seam of the binding. you are folding that binding four layers thick so it is a good idea to just trim out the bulk where the seams are. it makes it lay a lot flatter. i also like to trim off the tips on the outside edge as well.
now were going to sew down the binding. i like the binding to fit tight against the batting edge. just fold the binding around and fold under the excess fabric. you should be folding under about 3/8". using 