Hello,
I currently have three dumerils. I have a pair that is four years old and a female that is a yearling. I have had them all since a month after they were born and I would not describe any of these as aggressive. The only time any of them has ever struck at me is while their in shed and I have only been bitten once by my four year old male when he was very young and in shed (the bite barely broke the skin). They do seem to respond to the first touch with a little jump, so I use a snake hook to pick them up then hold them. They are also a fairly shy snake and some wont eat if handled to often. I also have had blood pythons, Hog Island boas, jungle carpet pythons and spotted pythons. I would say they are easier to handle than any of those with the exception of spotteds. They make great captives and are beautiful snakes I would say go for it and good luck.
Erin,
P.S. I would recommend getting one that has already fed several times as they can be difficult to get feeding.