Whatever you do, DO NOT loosen that line or have it loose when the engine is running. If you are doing so to try to gravity bleed, that is fine, but that is the high pressure side, so don't expect much to come out.
If that line is loose, you'll have PS fluid all over the engine along with the garage floor.
Best way is to jack front end up off of the ground and turn the steering wheel back from stop then back to stop, but don't hold wheel at full stop. Letting the foam settle overnight is not a bad idea.
Good Luck