I can help you an awful lot with that if you want to.
Yes, please - I need all the help I can get with how to apply textures. I will write a separate post to summarize what I have found out so far and some further questions.
You see that weird blue triangular thingy hanging in the air, and completely ruining the concept of realism? Point your mouse at one of them, right-click, and choose "Invisible".
I also switched off those pesky little blue road "lanterns". Thanks for that.