Often when working with curves there can be a huge amount of filing, sanding, scraping, and spokeshaving. The goal is to get a smooth consistent curve that is flat and 90 from the reference edge. While blending everything is enjoyable it is also very time consuming. This is especially true if the surfaces are going to get veneered. Nothing worst than hollow spots behind the veneer due to your substate not be flat and continuous. So for me my favorite go to method for blending curved surfaces is the flexible sanding caul.
Tips like this is what makes a frustrating day turn to the better quickly.