go to:
http://www.adventurequilter.com/
choose 'learn with ellen'
choose 'free articles -directory'
choose 'facing' (about 1/2 way down the list).
she gives three methods. i like method three.
in answer to your question, the edge stitching holds everything done, so plan some decorative stitching close to the edge. maybe just follow the wave once or twice.