I would suggest going out in 58 seconds if you want to break 2. A perfectly executed 800m race should be positive split by a couple of seconds. Watch the pro 800m races. When going for a fast time, the rabbit takes them through in 49 high-50 seconds. Usually the second lap is 52-53 seconds. Rudisha's world record had the splits 49.28 + 51.63 (a differential of 2.35) = 1:40.91.
I am a senior in high school who ran 2:00.09 last season, and am looking to break 2 next week indoors.