Very carefully!!! Not only do I not have the money, and never will have the money for a long-arm machine, I wouldn't have a place to put one, either! I've done a large bed quilt on my machine, and it was a royal pain in the butt, but I got it done. It just takes lots of patience, and lots and lots of checking and double-checking before sewing, to make sure there aren't any extra pieces of fabric under the needle that don't belong there. Not an easy thing to do...