Just experience from owning one female dumeril's boa and talking with other dum owners, their size range "maxes" (since technically they continue growing very slowly for life) at a pretty wide range for either gender. But it's a bell curve, and the average amongst owners I've asked seems to be 6~7.5 feet.
I doubt they'll be too big to handle for you, even at 7~8 feet. I'm 5'5" and my dum right now is already about 5'3" stretched out, and 3 years old. But when she's curled up, she's still small enough to carry in my arms like a baby, and really not half as big as you'd imagine (at least what I feel personally, being a scrawny girl). Snakes can condense a lot when curled up compared to their "stretched out length". She still has growing to do, but I'm not worried at all.
I think hearing the "length" of certain snakes can be deceiving as well. Different species have different proportions. A healthy weight dum's proportions are longer and more narrow than a ball python. So imagining a ball python at 7 feet would be much heavier than a dum at 7 feet, for example.
Personality-wise for mine, she will just sit there and chill when I take her out. Mine moves very little.
Especially if you get a juvenile dum to begin with and handle her as she grows, you'll be used to handling her even if she eventually gets to 8 feet, so it won't be a sudden feeling of "I can't handle this snake".
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