Good advice Steffen... I read loads and loads of articles about mixing and mastering, there's no receip at all still there's some common facts.
Lately I've been trying a different approach on the mastering chain. Most of the people uses the eq as the first processor, I've been trying it as the last and I think that is better because, for example the compressor, change the tone of the mix, exciters do the same, etc.
If you have the eq in the first place, you end up changing the mix when you turn on the compressor.