Level Streaming tuts and documentation no matching 4.15 - HELP

I’ve read UE4 documentation, viewed numerous video tuts, see slightly different approaches to Level Streaming, but my 4.15 GUI goes off map with what each these sources presents as what I should see. Many thanks for some current information since the furniture got rearranged. I’ve organized sub-levels to follow the logic of Level Streaming, need assistance on whether a TriggerVolume or LevelStreamingVolume are used, on which level, and what happens in Blueprint with setting nodes. I’m noob, but this ain’t rocket science. Many thanks for your time!