a TT expert i am not, but as I understand general pacing strategy:
A) go harder on the uphills than the down hills, go harder into wind than with it, go harder when conditions are harder, you make up more time incrementally than you do by going harder when conditions are easier - BUT you want your effort variation to be fairly narrow. So ....
B) related to (A) shift your gears. often. front and back. when i first started training with power, i'd set out to do steady efforts (tempo/SST/whatever we want to call them) and find that i was way above my wattage target on uphills and way below on downhills. so i started using my gears to get into an almost "undergeared" range for uphills and "overgeared" range for downhills. same applies to a TT. Steady pacing with terrain based variation is what most folks are after because it results in going the fastest and is most efficient. So, when going downhill shift into what feels like a huge gear and let your cadence catch up, shift bigger as you go; going uphill transition one cog at a time to keep your wattage steady and let your cadence catch up.
C) try to stay aero the whole time. TT bikes are meant to be ridden with the body low and narrow. wide and high, might as well be on your road bike with road bars.