Well to start off I have never even been remotely near Dunwich, except maybe tenpenny towers. I have T51 B power armour so I am like a [censored] tank. I can either go in with fawkes or the robot companion, (I forget his name.) As for my own weapons ive got an assault rifle and a few other pistols and such. I also have chinese stealth armour. I also do have a ghoul mask. Also please not too many spoilers in case I do want to go inside. How do I handle the death claws roaming around outside? Should I just sneak into Dunwich explore with my ghoul mask and get out? Or should I pull on my power armour grab one of my companions and try to roll through like a tank. Also would it be effective to stock up on grenades and try to toss them into occupied rooms?

I'd go with the tank approach.

Go in a tank