I have raised around half that amount in any one round, but I have recruited a range of specilists to work with us on projects, so here is my 2 cents ...
Tricks, never worked, enthusiasm and a solid plan for the product did.
These days I focus on the roadmap, what comes first (can't live without), what will wait (features to draw most people), what we will most likely take input from the market about (things that could go either way).
Honesty about the costs, development, marketing, sales and support. Take it year by year, talk in numbers of people needed to meet demand ... don't make up some magic figure say average $80K per person, 3 dev, 2 marketing, 1 support in the first year ... if it goes quicker we expect 2 more support and 1 more dev ... marketing should stay as is.
If there are several small investors then explain that you will only take their money IF you get the minimum required for one year ... But your aiming for 2 through 3 or 4 investors ... more an the dilution is to high and I wouldn't bother.
Good luck, let us know how it goes ...