I don't know, even on first playthrough, I only had problems with attacking grove and spider boss. But it was fun, first experience for a normal level of difficulty is quite decent. Main rule is don't treat it like a board game, treat it like a video game, and then you will quickly understand what's what.
I noticed that for many DnD fans this game seems difficult, a strange coincidence.
Maybe it's easier for DoS fans ?
I'm not a DnD fan nor a DoS fan and I played lots of tactical TB game... the first playthrough was difficult to me.