To each his own. As Dwight said, the highly regarded master craftsman Lou Alessi, shared with me that he did the dye right after the pieces were cut then he did the edges then.... He and I had a discussion about this because at the time I was just getting started in leatherwork and making holsters. I was having a problem with any of the "boned" parts of the holster not taking the dye very well. He asked me the process I was using and I told him my process (at the time I was doing the molding, boning and stitching first and dye last). Lou then said that I should try doing the dye before the molding and boning as these processes compress the fibers of the leather and can make it so that those parts of the leather become more resistant to taking the dye as evenly as the rest of the leather. I have been doing it that way ever since. As the others have said, to each his own and whatever works for them, works for them. Experiment and enjoy.