We should seek Gods advice and help in reaching the lost sinner, not some "mans" plan of salvation. God already has a plan for salvation of the sinner.
Pray, Pray, Pray, and then Pray some more that Gods anointing would be on you so that you can be a help to others by His Divine Power that is within you. He will give the words that the this certain sinner needs to hear if you will seek Him, trust Him and humbly allow yourself to be a vessel for His use.
Psalms 118:8 It is better to trust in the LORD than to put confidence in man.
Jeremiah 17:7 Blessed is the man that trusteth in the LORD, and whose hope the LORD is.