I am a new quilter and am just wrestling with the final machine quilting part. I have made several quilts without using this final step. Previously I have only stiched in the ditch plain squares,but would love to try stipple etc. My question is, Where should I begin the machine quiting? In the middle of the quilt? In a corner? At the side? Is there the "correct" spot to start to produce the least puckering etc?