If you can find somebody that is running the pace you're looking for, then all you need to do is tuck in behind them and let them do the desires. It's one of the simplest ways of pacing yourself because you don't have to learn how to judge your effort levels, you don't need for you to do the math to find out if what your watch is telling you is where you prefer to be, you don't even need to wear a watch if you do not need want to.