we all fail and hopefully learn from our failures. How many times did you fall and get back up when you were learning to walk? As far as evangelistic styles, a notable example is Jonah. He proclaimed what God told him to and he was successful. The right portion of Truth in the right place and time according to Gods will is what we as Christians should strive for.
John 3:17 For God sent not his Son into the world to condemn the world; but that the world through him might be saved.