i've never tried this, so have no idea whether or not it would help, but ...
if the problem is that you can't see the stitching already done, get a single strand of embroidery floss, or any other really thin thread, of any color. every so often let one of your quilting stitches tack down a snippet of the embroidery thread. that will mark your stitched path. when the job is done, just pull out all the little thread snippets.