SureAI

press the key to open console-it's the ~ key on my game:

type "modpcs heavyarmor 10" to raise your heavy armor skill 10 points.

press console key again to close console.

Note that I haven't actually tried this in Nehrim, but it should work. Make a save first, just to be safe.

OK thank you very much ! No need to worry about the style of my character now, I'll just switch armor types if I need to ^_^

I'll try to stick to light armors but if I stumble across a very good looking heavy one..........