With this trimmer you will get the precision you want. The blades automatically sharpen themselves and the paper is automatically held down with a clear paper clamp to ensure that the cuts are uniform on each sheet. The circular blade can cut in either direction and is hidden underneath the plastic housing to keep the blade safe for every day use. You can line up the paper properly with the grid and use the thick guide bar to help you line everything up. You should also know that the unit can be mounted to the wall with the purchase of the mounting stand or you can choose to use this on a flat surface.