Ah, you get an overlapping uv error ^^
You can solve that error with a 2nd uv channel:
i: yeah, you can always scale it in the UE4, but just scale it up in blender
ii: when you have the texture on your desktop/folder then just import it from there, but sometime blender artists store their textures in blender, but I think that wont be the case in your situation ^^
iii: Here is a tutorial how you can assign more then one texture/material: . WHen you double click the mesh you should see material slots