1. Create a perfect investor pitch (deck) + killer executive summary
2. Practice the pitch until you do it perfectly.
3. Do your market research and validation of the service/product so that you have actual data and facts to show the angel investor.
I've successfully helped over 300 entrepreneurs and can help you with all the above. After scheduling a call, be sure to please send me some background information so that I can prepare before - thus giving you maximum value for your money during the call itself.
Good luck