You can ask for the name(s) of LA in your area at the local quilt shop if there is one. Everything mentioned above is great advice. Ask for references and to see completed pieces. If they do not provide a written contract, insist that something in writing is created listing both your names, size of quilt, who's providing the batting & backing, the name of the panto (if used) or any details about the quilting, including thread color, and any additional services, such as binding, piecing batting etc. and an approximate completion date. LAst but not least, you should have a statement that the quilt top will not be altered AT ALL. If he/she does not want to provide this in writing, I would seriously consider a different quilter!