Should be easy, if you can keep it flat. Not a big deal on a smooth table, just unroll it a little to get your length. I routinely unspool 16mm to reload 16mm cartridges. With 35mm I use the Alden 200ft bulk loader and have spooled a 600ft roll on to smaller 200ft rolls to fit in the loader. Doing 100ft for the smaller loaders should not be a problem. On a smooth table, once you get it going you twist both rolls at the same time. It is slow going but as your take up roll gets bigger it moves along faster.