i've been working on a small cabin this week. it's not too hard. i don't quite understand some things about uploading it in world though, like the physics part, but other than that, it's just a bunch of cubes.
lol, I'm definitely not an expert. I'm still learning structures as I go along. Small things with less pieces are easier for me. Also, you can use sketchup and import into blender. I haven't tried it yet, but