Spooling down from a big roll is a wrist killer. Your forearms will be aching. I used to spool the cassettes in the bathroom on a stool at night. my arms outstretched to both sides is perfect for 36 exposures plus leader. Tape was already applied to spools which were stuck on a rail, which the film was then applied and rerolled in with the help of long blunt tweezers which helped reroll them in very quickly. its funny how adept you can get quickly after just a few rolls, my scissor cuts became perfectly straight, and my taping to the little bit of leader from discarded cassettes became perfectly aligned (which I checked after when developing).
Its a bit to hot to do that now since i dont have central air, but thats a good way to do it if you dont have a bulk loader.