Dd has the sound of th in that, thy, this or breathe.
G is always like g in gave, give, or get.
H is always well aspirated. Oe, oi, ou may be pronounced as oy in boy. Perhaps it will make this clearer if we give approximate pronunciations for the chief proper names in the book. Also the accent falls on it. The ed is equivalent to English head, when once the initial h of that word has been dropped.