how to attach vintage fabric center to crocheted edge by: Valerie Kalyani
It will help stabilize your linen if you mark your circle on the cloth, then sew on the line with a sewing machine around the circle before you cut it. This will help keep the linen from fraying as you hand stitch your way around and help keep it from stretching as you sew the biased parts around it.
You can still pin the lace down to keep it even.
I would also only cut about 20" at a time for the same reason. A simple whip stitch done so it shows as little as possible will probably be fine for attaching the lace piece.
If you can crochet yourself, you might consider getting a ball of matching crochet thread and 'sewing' the lace on by making a single crochet around the cloth, attaching the lace as you go.