Help with HM pacing

Will be running my first half in a couple weeks. My goal is to run under 2 hours but not sure what my best strategy is. I have the choice of running with the 2 hour pacer or 2:15 pacer. Both of them are supposed to run even splits. I'm worried if I start at the 2 hour pace ill bonk out, but I have confidence I can run negative splits if I start around 10 min a mile but am unsure if I'll be able to makeup the time. Thoughts?