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For B&W negadoctor is very easy, nothing major with it other than setting white balance, then setting the film base colour and then adjusting D-MIN/D-MAX to the exposure you want. You can then leave it there or go crazy.

Colour is a bit more hands on and with negadoctor you really can get a nice starting base but it's much more manual. You need to make sure colour profiles and white balance match your scaner/dslr scan. The you need to set up the shadow casts and highlight colours. Much more manual just to then get a rather flat image with correct colours to your liking. Then it's more regular raw workflow so altering contrast and saturation but it's nothing too hard still. But it's 100% more hands on the using NLP (this is what I'm assuming you are using. Check YouTube see what you think.

I don’t but here’s some documentation https://darktable-org.github.io/dtdocs/en/module-reference/p...

If you want a quick-and-dirty inversion, you can take a tone curve tool, set it to the XYZ color space and make it go top-left to bottom-right instead of the normal bottom-left to top-right. That should work afaik.