Get some 100' spools, a changing bag, scissors and some alone time. I've done this before, transferred 5 400' cans to 20 daylight spools w/cases and tape. Run the emulsion side down and your perfs will line up as needed. Also, don't forget a small pair scissors to snip at the end of each 100' segment. Good luck and when you take a break, do it between spools. Good Luck.