HoMM VII Haven Units – Haven faction units from the seventh installment of Heroes of Might and Magic.

I'm not sure that any manual, no matter how clear, will help a "couple of novices" who don't want to or can't delve into the details.

But, I heard you. I don't want to and won't promise anything, but as soon as I figure out the bug that causes models to glitch with smoothing, I'll try my best to find the time and write a tutorial describing how to import a model into the game, using a model from Heroes 7 as an example.
Then, we can update this text as new information becomes available.

They want to, but they can't, and unfortunately, I don't have the time or the moral strength to delve into all the nuances... plus, there's a ban on using pirated software at work and using my own laptops... sometimes, there's time at work, but without the necessary tools, it's impossible to work on it!

And they want to create cool models right away... one is currently learning Blender (which is very commendable, as I understand - they're learning it at university), and the other is keeping quiet about their achievements in 3D... and there are so few active and capable people to create content anyway... however, there's still a lot of work to be done in NHF, especially in terms of visuals!