You do not. I have never made a perfect quilt. Some are very very good and some aren't. I am fine with that. I quilt for my own pleasure. No one I've given a quilt to has said anything like "oh, I see a stitch not in line" or anything like that. If you are hindered by an idea of perfection you will never create anything. also, if you compare your own quilting to a computerized long arm, you shouldn't. Two different animals, in my opinion. Not that one is better, but they are different.