There's nothing wrong with "do-able" dreams. And you're most likely to get a hatchling, so it will grow up with you...you'll have plenty of time to adjust before it's "oversized". I used to raise & keep Taiwan Beauty rat snakes- very similar, gold colors with black- very pretty- they get big, but I didn't find them to be that difficult- not really biters- just fast & active snakes with great appetites.
I love all kinds of rat snakes...they're active & interesting, & normally very easy to feed.