Seriously, even if your idea is good, you are going to have to beat people over the head to come along with you. History is littered with some of the greatest inventions almost not happening because people did not believe in it, or could not be bothered to invest effort in it because they where too busy.
Take myself for example, I would be the kind of guy, you would be worried about stealing your idea, I am a developer who has done several start-ups. I could build it, and I could get the money to grow it. The reality though is if you told me what you where doing, I would give you honest feedback and wish you well. The reason being, I am too involved in my own idea, and too emotionally invested in it, to drop what I am doing to try and steal yours. Not only that, you would be hard pressed to get me to help you beyond some recommendations, because I am just to busy.
It's the same pattern with investors, people that have the capability to steal your idea are just to busy already. You have an uphill battle just convincing them to come along for the ride with you. Think about it, if you talked to a VC, they are not going to go advertise for developers assembly a team and develop it, just because they think it is a great idea.
If they think it is that great, they are going to take the easier path and just fund you. Fears of the established person (the people you should be talking to) stealing your idea are overblown.