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When you start to feel some resistance, give it a tweak. You need enough torque to compress the olive, but not enough to round the flats on the bolt going into the lever or caliper. There's a fairly wide margin for error, so just swing on it until it's nice and tight but not total bastard tight.
It's difficult to describe, but you want to feel like you're putting a bit of effort into tightening it without the veins bulging in your biceps/forehead.
Brommers
LeBlaireau
Shimano road hydro brakes - how do I know when the hose connector bolts (at the caliper and lever) are tight enough in the absence of a torque wrench? Is 'a bit painful with a little 8mm spanner' about right?