If you enjoy expert, that's great, but like how
@Calen said it's not easy, so I would say definitely not recommend it to newbies. Because most newbies won't enjoy it, I think.
It's up to you how you play, but I think, the game is much more than just fighting, and I would say, especially for a first full playthrough, a boss rush is not necessarily that good of an idea, you would miss out quite some stuff that way. of course, it depends on player, but I think, it's good if you just take it slower, and try out a bit of everything, adventuring, building, fighting, and all.
Either way, it's up to you how you play.
Have fun!