jME3 is well designed and fully documented, it’s easy to learn and easy to use.
You will be happier to use jMonkeyEngine SDK, it’s an IDE depends on NetBeans.
But if you have your favorite IDE other than NetBeans, it ok. There are planty of people who use Eclispe, Intellij, Android Studio, even sublime. With gradle you can easily intergrate jme3 to you project.