I agree, you need to start with something smaller. With larger quilts you can roll them, or you can nest them, sort of scrunch the quilt up. Additional support around your sewing machine to hold the quilt is beneficial, an ironing board works well. You don't want the quilt to hang over the edge and drag it in a specific direction. Finally you need way way more than 100 pins! You should not be able to put your fist down without touching a pin.