You will just have to start trying. There is still a lot objective c that you will need to write for various kits that haven't been ported over.

So learning how to write bridges and view managers are pretty much essential.

Very active issues tab and community though, so you can work through most thing, but definitely room for improvement though. But the biggest struggle was keeping with it and buying into React way of doing things.

hit me up on twitter if you have more specific questions @myusuf3.