It's not rocket science.

I'm an FO, not a CA, at AA, but spent many years as a CA during my Regional days. Line up and wait meant I'd turn on my nose taxi light. However, if I saw another aircraft opposite me, or nearly so, I'd use DISCRETION (what the heck is that?!) and courtesy and turn it off again until I was pointed away from the aircraft in front of us. Then, nose taxi light back on again.

Cleared for takeoff, all lights on and away we went. Pretty damn simple. Even a Caveman could do it.

I've noticed SO many CA's - although not all of them - at my carrier that don't seem to care at all that they're blinding the pilots opposite to them. Not sure where that attitude comes from. Have some courtesy for your fellow pilots.