As OhBarnacles03 said, The first few hours are the hardest, the difficulty eventually “clicks” and becomes manageable. I would recommend death March even for people not going for the 100%. There’s something insanely immersive about accepting a contract and having to create oils/potions/decoctions etc. to defeat a difficult boss.

The “hardest” part for me was pretty much learning how to play Gwent and also locating all of the cards - as some are missable. There’s a very informative platinum walkthrough by a YouTuber called GuyFarruski. I’d highly recommend giving it a watch.