You won't disturb anyone, that is what this forum is for. There's almost always someone to help with any kind of problem.

My fault is that I can hardly wrap around my brains to that kind of thinking that the SH3D has.

You have to understand that originally Sweet Home 3D was for interior design. Over the years it has evolved into much more. Where at the beginning you had to almost exclusively depend on the offered models you can now create your own very detailed furniture. Furniture that can deform if created that way: opening doors and windows, rotating or sliding furniture parts (opening drawers!). Lights that you can manage for creating great photos and video. There is even a tool to create a terrain around a house.

But, as with any advanced software, there is a learning curve. What Sweet Home 3D offers is that you can start immediately with just trying but if you want something specific you have to learn how to do that. It completely depends on your own wishes how much learning there is to do.