Ok, there is an "equator" around the coconut - if you look at the shell, there is what appears to be a ring around the middle that is slightly indented. You take the coconut and hold it over your sink in the palm of your hand, and with a heavy object, I use the back side (not the blade) of a meat cleaver, you strike the coconut on this line, rotating the coconut as you hit it. Just pretend the coconut is oh, I don't know, your ex, your boss, that will give you the ability to hit it hard enough so that you should see it start to crack in this seam (who knows, you might derive a small amount of tawdry pleasure in the act ;-]). You will most likely have to turn the coconut a full way around more than once before the seam starts to crack, it just depends on how hard you strike, and of course, how good your aim is. When finished, the seam should crack all the way around giving you as close to two equal halves as you can get without a bansaw!!
