Front Left Brake Line Replacement

[2004bmwx53i]

Hi everyone,
I had a hard job to undo the brake hose off the brake line. It took me all day to undo the nut, only did I manage to break off the nut from the line. Now I have to replace or re-flare the end. I don't want to flare the line while attached, it can easily go wrong.
Can someone please show me the correct way to get this line out so that I can either replace it or re-flare the end. The line sheared off just under the nut, so hopefully it won't be too short. The other end is obviously connected to the ABS module.
PN 34326755499, for 2004 X5, 3.0i.
Thanks,