You are a hell of a player then dude, most of my IRL friends actually found that hard was really hard. Even I don't think I'd be able to Ironman PotD without a lot of cheese.
Eh you will never know before you try, it gets really easy after the early game because you start to outlevel everything just like in other difficulty settings.
You can simply skip harder encounters if you are worried, and get a min-maxed tank unlike me.
This, honestly the hardest part I've found on POTD is those shade/shadow/phantom fights in caed nua and eothas' temple (well, and gramfel the wayfarer, but I was being stubborn and trying to do it at level 4), once you start to get levels it becomes a lot easier.