One other thought: Shoemaking includes numerous steps and tasks. To simplify, those might be categorized as Lastmaking/fitting, pattern making, clicking, closing (sewing the uppers), and making (or bottoming). In high volume contexts, those tasks are generally given to different workers, because mastery of any is a long process. While learning to hand-close an upper will no doubt help an aspiring shoemaker learn a shoemaker's stitch, and also require learning to make patterns and skive leather, I personally am not so much of the belief that it is a sensible use of ones time. It will take a really long time to do it, time that could be perhaps more productively spent on learning other shoemaking tasks. I would recommend finding someone who could close your uppers for you, so you can spend your time on other things.