Last few evenings I made some 1/4" and 3/8" lines, flared them and bent them, it is quite satisfying and not all that hard.
I will say that I first used stainless steel for brake lines on two different trucks, the first one was absolutely no fun as I was learning how to do it as well as fighting the tough/hard to work with stainless. The second one went easier, but still no fun.
Lately I've been using copper-nickel line and it is a pleasure to work with, easy to flare and easier to bend and fit.
You can find some on line, or I have some for sale in the misc. Stovebolt stuff section of the swap meet.
Grigg