First, measure out the length of hose that you need, mark it with a marker, and wrap it with the packaging tape.
I use this tape exclusively. I've tried them all, and this is the only one that I'll recommend. It's regular clear tape but with fiberglass strands. It's strong engough to keep the overbraid from expanding, yet extremely easy to cut when cutting parallel with the strands. You can find this at any chain store or hardware store. This is also what the hose manufacturers use when cutting their hose.
Chuck up the hose in the inserts. BTW, these inserts work just as well to retain the hose just as well as the hose ends.
Begin cutting. I recommend to only cut in one direction. Sawing in both directions will make for a messy cut. Only pull the blade across to cut.
In most cases, you left with a very clean cut. On occasion, you will have to trim a couple wires from the overbraid, but that's easily accomplished with some wire cutters.