On a project like that I MAKE myself sew a few seams on the hated project before I can sew anything else and before you know it the project will be coming along nicely. It breaks it up so you can at least see progress and still don't have to put in a lot of time in one sitting to get it done. Your sister is more important that your disgust with the project and sometimes I have been pleasantly surprised after a while to get less aggravated by it as it progresses.