UVs and Lightmaps can be very frustrating at times! I can’t say I didn’t struggle with them at first. Heck, there are even times now where I over think some things and just have to go back to the drawing board and do it over or think more clearly about what I want my results to be. There are a lot of options in UE4 that may not be something obvious at first. I’ve fallen into that trap as well. It happens, I learn, and I pass it on to others as I see everyone else doing which is just awesome!