What I meant by ‘easier in UDK’, that version of the Unreal Engine had gravity manipulation programmed in as part of the Physics Volume. UE4 does not because it is a completely physics based engine.
If you aren’t yet familiar with blueprints I would suggest going through some of the tutorials we have available on our Wiki.
With that said, changing gravity in UE4 is a bit complex. I will continue to search for more info to help you figure out how to set this up.