I have been quilting for about 7 years and use my sewing machine to Free Motion quilt on sizes up to and including twin. Larger quilts are either sent out to a professional long arm quilter or I quilt it in sections before I stitch it together. Machine Quilting in Sections by Marti Michell (
www.frommarti.com ) is a wonderful book that explains how to do this.
I also highly recommend taking quilting classes from a local shop. Most offer classes in hand quilting and machine quilting along with basic to more advanced quilt making.
I hope you will try doing it yourself-- maybe begin on a tablerunner. It is a hobby that is very addictive -- in a good way!