2. Technique. I try to relax and keep my upper body as still as possible. Little or no head movements, TT helmet flat and touching my back. Correct cadence.
3. Mental toughness. Focus on work tasks. Concentrate. And most importantly - being able to be tough and hard towards yourself. TTs will hurt, period. This becomes especially important during the last 5-6km and races are usually won here. From 5k in it's an all-out, nothing held back, effort. This is going to hurt and the winner is often the one that can dole out the most hurt.
All I do during a TT is focus on these 3 tasks. Simplicity is important, just go through them over and over again. When I evaluate my performance after an effort, I evaluate it based on these 3 items, NOT my placing. Placing is irrelevant at this point.