If you don't already have in your toolbox, get a set of flare wrenches before attempting the removal and replacement.
When your testing do not get your flesh close to where a high-pressure hydraulic leak could penetrate it. That is bad news if you do.
All major farm and most part stores fabricate hydraulic hoses, and many have a separate entrance door if there really in the big time.
Not hard, just tedious and messy. Oil adsorbent, red rags, nitrile gloves and so on. Goggles or glasses minimum when testing.
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