Cutting precision is of the most importance, secondly cut, grind, foil and tac solder no more than 3-4 pieces at a time. This allows you to quickly know how well pieces fit. If you cut everything at once, having a couple of pieces not cut correctly can throw everything out of alignment. There is also a chance that you will lose the markings and not know where each piece fits. Pieces this small start to look alike very quickly.