I don't know Flash either so my advice will be as someone that has been through some pretty intense interviewing processes. There could be someone that interviews for this position that has more applicable experience than you do but doesn't come across as well and you'll get the job. How to come across well? -Passion. People, whether it be in work or in life like to surround themselves with people that are passionate about what they are doing. Let him know why you want the job, what excites you about it. Ask him questions about what he foresees as the projects greatest challenges and then let him know how you think you could help address the challenges. People hire people that will make their work lives more enjoyable, easier and successful.

Most importantly, sell yourself on the way out. Shake his hand look him in the eye and say something to the effect of "I'm excited about this opportunity, I know I'd be a great fit and I look forward to the opportunity to work with you. When can I expect to hear from you"?... or something like that.

If he asks a question that stumps you say, "that's a great question"... this buys you some time to think and then answer the question in a way that allows you to focus on something you had wished he's asked. Bill Clinton famously said, "I always answered the question I wished I'd been asked". -Guy always seemed pretty cool under pressure, didn't he?!

Be assertive!

On a personal note when speaking, slow down your pace and ask questions. Don't be nervous. You've got this! You're mother-effing-insomniasexx!

[edit] -Go in to this with the mindset that you're well qualified and they'd be lucky to have you. Confidence is king.

Also, don't ever say anything negative about a former position, boss, project etc. Pretty much zero negativity. -You don't strike me as someone that this needs to be pointed out to though, but just in case.