I think you are right to be a little intimidated, it's a deceptively complicated style. I think mostly because it's transitional. Figuring out where the Victorian construction techniques end and what would become the 1920s techniques begin in this hybrid style is a challenge.
A key seems to be the fabrics. Everything is soft and drapey (little-to-no taffeta and even the rare velvets are drapey silk ones), with an emphasis on varying textures and in layers. Usually at least three fabrics in a dress. It least that is what I'm seeing.
I think it's achievable though - especially with practically the whole of the costuming world making this gown at the same time. We'll have no lack of inspiration and support in the next few months, which will make all the difference I think.
You can do it!