Wrap hose with duct tape before cutting (center of tape where cut needs to be). Use cuttoff wheel (thin wheel), if possible. Hacksaw is tougher to get right. If you use hacksaw, use very fine teeth. Disassemble AN fitting. Slide sleeve piece over hose. Carefully remove tape as to not fray metal threads. Oil end of hose surface that will slide into the AN fitting. Find a good, solid, vertical surface - like end of work bench, door jamb, etc. that you can push against. Start hose end into fitting - watch that all braids go into fitting (use very small screw driver, or such, to help push all braids into fitting before pushing, if necessary) and push hose into fitting using vertical surface to push against. Push hard. Hose should go all the way in. Re-aasemble fitting by screwing the sleeve part over the male piece you just inserted into the hose. Tighten snug.
Oiling hose braids is important for ease of installation. Oil inside and out of end to be inserted. I hadn't heard of leaving the tape on the cut hose, but doesn't sound too crazy - it should help keep the braids organized. In that case, the tape can't be overly thick, so one or two SNUG wraps should do it. Try to use a cuttoff wheel, or measure hose and take to speed shop, or such, and have them cut it. I used the cutoff wheel and it worked fine. My local shop uses a "dull" metal cutoff blade (no teeth), which they swear by. Push hose into fitting with one hard push, if possible. You can't get it too far, so push until you are satisfied that the hose has bottomed out.
Good luck.