There are several variations of these fittings available from several manufacturers. In this case we're using a stainless steel AN-8 fitting.

After I determined the correct AN Fitting size I need and the corresponding hose, I measure the desired length.

Wrap with duct tape or electricians tape where you'll make your cut (to keep it from fraying during cutting and assembly).

I use my band saw to cut to length. A piece of angle iron (clamped against the blade) makes a steady guide to hold the hose during cutting.

Next I gently feather the inside liner with an exacto knife to remove any burrs.

Then I ensure the liner is round by gently shaping it with my needle-nose pliers.

Ensure the liner has no frays on the outside. I use my heavy scissors (carpet shears) to trim and 'even up' the stainless steel braids around the outside.

Then slip the nut over the hose.

Push the nut up past the tape.

Carefully unwind and remove the tape without letting the stainless steel braid unravel.

Carefully separate the steel braid around the edge of the hose liner. This is where the tapered cone will slip in.

Gently slip the tapered cone in place. Ensure it is slipped over the outside of the liner and is not cutting into it.

Push it down against the bench to ensure it is seated all the way.

Gently feather off any rough edges on the inside liner to ensure the next piece will slip inside.

Insert the outer fitting shell.

Carefully make sure it's seated all the way in.

Run the nut down onto the threads making sure you don't 'cross thread' it.

Tighten the nut with a socket and wrench without distorting it.

Another trick you can use is to clamp a six-point deep socket in the vice to hold the large nut, then use a wrench or crows-foot to tighten the nut without distorting it.

Here's the finished product. These ends can be reused many times.