I don't post in this section of the forums very often because, frankly, I have next to no talent for painting (just reasonably okay at following painting guides...). However, for the mere mortals who visit this section, I think I can offer some hope - I painted up the Chaos Knights army set in just a single evening and they do not look half bad if I say so myself...
Full kudos to Veritsee Models, who I followed the general principles of to paint these up:
https://www.youtube.com/watch?v=ot6FxBk0rEw&ab_channel=VertiseeModels
If you fancy a swing at these (and if you are a lazy painter like me, I cannot recommend this approach enough), I put together a little painting guide to complement Veritsee that uses the Citadel paint range:
https://ttgamingdiary.wordpress.com/2022/05/18/house-slughorn-chaos-knights-army-set/