I have a cracking idea but know very little about crypto currencies

[Skyborn]

No there isn't really. If you share it on a public forum there's always the chance that someone who is more skilled than you will take the idea and realize the project. But that only implies if it's really good. I would suggest to just start learning the skills needed or hire someone for you to do so.

[CBJon]

Ideas are fantastic, but without action it'll never be much.

Best way to get started is to write down your concept.
Build a framework for what you want to achieve.
Discuss it with those close to you, let them criticize it, use the feedback to validate your business plan.

I recommend you look into 'lean startup methodology' just for the initial planning framework it offers.
It really forces you to build a straw man, test it and see how it holds up to real world criticism.

If you pass this stage, then you can start by building a minimum viable product and  looking for external backers.

It's how I've built every business I've ever owned.

Just my opinion.

[shield132]

I have been sitting on a good idea for a few years now and would like to share the idea for comments but I'm worried that someone will do it themselves. Is there any way of protecting the idea?

Patent idea if you think it's something amazing. But if you don't know much about crypto currencies, how do you have great idea? Well, if you find something new, if I were you, I would learn much about crypto in a very short time to release idea as soon as possible. Bitcoin wiki is great way to know technical sides of bitcoin, this forum is about bitcoin and search threads also.
Well, if you are still looking for serious people, then patent idea.