[JavaBrewer]

We're talking compression fittings right? Wow I never had a problem.

- remove old section of pipe where old fitting lived
- sand paper the copper pipe to clean it up
- install compression fitting and water lines and lightly tighten
- turn on water
- tighten fitting using two wrenches (one on nut and other on fitting) till the water stops leaking

I admit getting the right access to do those steps can be a challenge. I loathe working on plumbing but generally have success if I follow the steps correctly.