Safety tip, do not run with the scissors while looking for the kaiser cutter.
I just wonder if dragging the negs through those cutter devices will scratch them (the negatives) in a serious way. Of course, cutting w/ scissors on a light box or white paper presents the same danger in some ways.
Like others, I find this post amazing. Without meaning to be personal, perhaps you need reading glasses. This is not a question of kit or special cutting devices, just correct observation and a sharp pair of sissors.
Absolutely no apologies are necessary.
And for those who recommend sharp scissors, I would add:
1) A light source below the negatives or slides will improve accuracy and repeatability; and
2) If you are like me, and are left handed, make sure the scissors are specifically designed for left handed users.
The comment is unnecessary.
Many other considerations come into play. For example, people who lack fine motor control, who are not ambidextrous, who have little experience in placement and measure with unfamiliar tools... still those too, with visual impairment, Graves disease or trembling. None of these is or should be a consideration to forbid 'having a go' at something which can be a marvellous personal achievement in the face of adversity.
So...there is a lot we can all learn by sitting back and reading of individual methods of achieving things.
None of these symptoms were mentioned in the original post.
I find it easier and allows more accurate aim if I cut my strips over a light box. I also find it easier if I flip the negative up side down (emulsion side up) and cut. I observe where the center is relative to the sprocket holes and aim. Smaller scissors with thin and skinny blades are easier than big ones.
We're not talking about symptoms, but different capacities of individuals. It matters. Not everybody can master cutting negs/trannies with precision. Likewise, sewing for many people is difficult and challenging. You learn something about yourself by making mistakes doing things like cutting negs/trannies. It galvanises you to do better. My first mistake many moons ago was using a pair of crosscut-jaw dressmaking scissors to cut my unmounted Kodachrome. Needless to say it was the worst hatchet job you could imagine. AND, I had better vision way back then than I do now.