Real Landscapes into Unreal

I’m going to attempt this as my first project in Unreal Engine.1: Import Real Landscapes into Unreal in under 30 minutes using Houdini and real world DTM data - YouTube

As a first timer what are the things experienced Unreal Engine users would have wanted to have known at this stage, if they were me now? If they were to attempt the project in the video?

I’ve only watched videos on it before… but today’s the day.