I must admit this is one difficult part of the process for me. (There are other difficult parts. I'll write about them as they come up—if I get time.) I want to jump in and get started but have to hold myself back. If I start work on a design that ends up being scrapped, I feel that I've wasted time and materials. So instead, I'm occupying myself by working on pieces the size I will need if the design is approved as is but can be utilized in another project in the works if the direction changes.
Oh the difficulties of staying busy and sane at the same time.