Um, tape it, use a chop saw with an abrasive wheel, unwrap and TWIST the outer fitting on. The chop saw helps make a straight cut, it's fast, and safer than a dremel or die grinder. Just hold the hose with your hand. Don't clamp it. If the backstop doesn't go right to the edge of the blade, use a piece of steel to extend the backstop so the hose doesn't flex.
The biggest boogers I have found to be the small, -3,-4, teflon lines. Once you master those, the big neoprene lines are cake.