In the first 1-2 weeks it is pretty hard to learn blender, but after that it should run pretty well 
But you have to keep in mind that the UE4 isn’t a modelling tool and bsp brushes will be normally replaced with static meshes during the development process. But you are still abel to bend a bsp:
(not perfect -> I havent edited the upper part, but for just some seconds of work it is acceptable)
