Hyles' method literally tricks people into repeating a prayer so he can mark them down and increase his numbers. For proof of this, just read the section where he talks about Romans 3:10, a great housewarming verse! I read this booklet hoping to get something out of it, but it saddened me...All it is is 1-2-3, pray after me and say the magic words.
What we must do is convict them from the law of God that they have sinned against a holy God, who will one day judge the world in righteousness. Law before grace. Don't read anything from Hyles. Instead, check out the Way of the Master by Ray Comfort/Kirk Cameron and the Soulwinner by C.H. Spurgeon. I do not believe Christians have any business giving the gospel to the righteous--we must first let God humble them. God resisteth the proud, but giveth grace unto the humble.