“We take a roll of toilet paper and a pair of gezunte scissors and cut through the toilet paper right on the roll (you obviously can’t do it in one cut, but you can easily do it in several). It’s quick but the length of the resulting strips of tissue varies depending on whether they’re from the inside or the outside of the roll.”
My father uses a box cutter, it works really well. Once I got married I wanted to do it also, but my wife doesn’t like the varying lengths