Hi,
You may find this hard to believe but it works great. Get yourself a mustasche trimmer. You can buy them at Wal-mart or CVS for about $15 or less. You may be lucky and your husband already has one. It takes a little getting used to. The trick is to hold it the opposite way you would use it to shave with the blades pointed down. Hold the seam allowance open with one hand and lightly touch the stitches with the trimmer. They sell a more expensive model in the sewing mail order catalogues to use to rip out embroidery mistakes.
I took one to a quilt retreat several years ago and they passed it around the whole time. On the way home most of the girls stopped and bought their own. When you are done run one of those sticky lint rollers over the fabric to pick up the cut stitches.
Good luck