The more you paperpiece the easier it becomes to judge the size to cut. Except for those elongated diamonds--I always cut them too short. I also have a large apothecary jar I throw all the odd shaped scraps in and use them as needed for smaller pieces. I love the precision of pp-ing. I will also NEVER use all the fabric in my collection (it's too small to be called a stash) unless I live to 114 years old. No guilt about some waste.