Yes and no. the best scissors are the ones that are the sharpest. It is better that you buy new scissors, the ones that are the largest and that have an comfortable grip to it, because cutting though jeans will be hard, no matter what kind of scissors you use. But if you are going to use an old pair, make sure that it is not dull, because of 2 reasons. One it will not cut easily and two, and if it do cut, it will not leave an smooth and easy edge to handle with.