The last Jagwire set I installed had instructions which said that no cable lubrication was required. But personally I use normal bike grease, thinly spread like the King's marmalade, on those stretches of the cables that will spend their time inside outers, and a dob in the under bottom bracket guides.
Most important thing is good cable cutters and opening out the brake cable outer ends (before ferrules) with an awl or similar (big safety pin sharp end).
Thanks, I have a good cable cutter, which also has pin for opening the ends, and for good measure I file the brake outer ends after cutting, I like when they look neat .
High performance is not much of an issue, my bike is rather low end and I don't cycle huge distances, I just need something reliable that doesn't need readjusting every five minutes.
Thanks everyone again.