I'm surprised no one has mentioned drag tacking yet. Put the fabric under the foot, put the foot down, put the needle down and start sewing, but *hang on to the fabric*. The feed dogs will be trying to move the fabric backwards and you'll resist the pull for a few stitches, then ease up and sew as usual. That will effectively give you a few teeny stitches at the start of your seam with no knob fiddling, or turning the fabric around and about.