Stainless steel braided line

Which stuff are you talking about? Just so I'm clear. I'm planning on using NiCop, as I've heard steel can be harder to get the flanges correct on, is harder to straighten, bend, etc.

I'm definitely only using braided flexible line at the flex points, though.
Yes I personally would not use nicop. I never could find any engineering papers on it and it's soft as hell. The steel stuff is not that bad to flare. Buy an extra piece and keep cutting it and flaring soon you will be a expert. ps it needs to be double flared just follow the instructions and make straight cuts.