Could someone point me towards a comprehensive terrain making tutorial?

I want to create some terrain using heightmap data but all the methods I can find (wiki, brackeys tutorial, etc) throw me stupid errors despite me giving it a 1024x1024 RAW heightmap and it’s just driving me insane. I would appreciate if someone could point me towards a tutorial that helped them do this, cheers.

I’ve got some random terrain manipulation examples in my MakeGeo project.

MakeGeo is presently hosted at these locations:

https://bitbucket.org/kurtdekker/makegeo