Wiki Tutorial on Transitioning to a C++ Project
I have posted a wiki tutorial on how to change a BP-only project to C++!
It’s really really easy!
If you want to package your game and use my plugins, you will need to do , but it’s really not complicated 
How to Convert a BP-Only Project to a C++ Project in 8 steps
will become unnecessary once Epic resolves of only being able to use plugins in a C++ packaged game.
But in the meantime, using my guide above, you will find its not that hard!
The above guide is a non-destructive process for your original project, because you make a new one instead.
So you can’t hurt your original project by trying my guide above, and it will very likely be very easy for you!