[manmal]

If you find a tutorial which solves this very problem you are facing, then you are surely good to go. I doubt however that you will find a tutorial on "how to increase traffic to a specific website by 10%". But that's what people actually pay for. They don't pay big bucks for you to implement that simple app or to fix that NullPointerException in their Java web app. I've been there. Yes, they might pay you $100/h for that, but not $10000 for the whole task.

You do need sharp wits and problem solving ability to deliver this kind of value, you need your methods in place (e.g. testing and validating everything) and you need to know where to look for unknowns. A good pitch is not the whole story as much as problem solving abilities are not the whole story.