You could learn it. But you should also realize the value in specialization. Your app idea isn't worth much. What should be worth something is your ability t

You could learn it. But you should also realize the value in specialization. Your app idea isn't worth much. What should be worth something is your ability to sell that idea. Your ability to market it into something people want. I think there's a balance between guarding a good idea and being paranoid someone is going to steal it. Talk to people about your app idea. Be passionate about it. If it's really a good idea and it's something you are serious about, people will mention it to friends who may be willing to work with you.