There is a gadget to help you - Martelli Zip Bind System. I purchased it at a show and was determined to learn to use it. There is a learning curve so be patient, but when you master it you will never do binding any other way. It's amazing! I can do perfect binding on a baby quilt in less than 1-1/2 hours. It stitches in the ditch from the top and aligns the binding on the back to stitch evenly.
The system is expensive but Martelli is having their semi-annual sale Aug 6-8 and it should be 50% off. The code for ordering is RL1507. The video is on utube - Martelli Zip Bind System & Stitch in the Ditch: Part 1. Hope this helps. If there is an easier way to do things I usually find it.