I typically use a ruler and rotary cutter to trim my quilt after quilting, I also use 2.25 in binding as I find that my binding is fuller and thus no need to leave the additional 1/4 inch batting around the edge to achieve the fuller binding.
On occasion if I do need more to get a fuller binding, I simply use the ruler and a seam somewhere near the edge and line up my ruler accordingly.
I can’t imagine using scissors to square up a quilt, that would be challenging!