Meh, I've had successive breakthroughs within like 20 minutes of each other. Also failed to break through and waited like 10-20 min and still got great effects and broke through after that.
Anyway, as for how to smoke it I agree with the bong recommendations. My favorite method is a little Chore Boy copper wool sort of stuff shoved down in the slide and placing the DMT on top of that. Easy Easy gigantic hits.