Your regular scissors are not ideal for cutting or trimming hair. You would need professional scissors (shears).
Have 2 symmetrical equal-sized holes
Have 1 small finger hole and another for larger fingers.
Is for Multipurpose
Average blade length & sharpness
Longer & Sharper blades
No matter how you much you try, You wont be able to reach the back of your head and trim properly
Your DIY Haircut results would always be inconsistent and wont look as good as you would have expected
Average home scissors have comparatively dull blades that causes hair split ends and may lead to other hair issues
The whole purpose of cutting your hair at home is to avoid salon, but with the chances of you ruining your hair in the process is much higher. And you may eventually have to meet a Pro to get the damages fixed