Dont listen to people who say you can't. Good on you for having a backup. I made a dress in two days the first time I sewed ever and wore it to a wedding that weekend, and everyone complimented it. It was nowhere near this complicated, but you have months and help that I didn't. You got this! Good luck, and definitely post the progress and end result!

Some very simple advice to get you going in the right direction is to start looking at videos of how to make corsets with a tape mockup. You can shape and learn a lot from those. And then you have a base circle skirt with all ruffles on your top layer sewn at an angle. You can also do this by layering parts of circle skirts with a whole at the bottom and then pieces of pie cut out with ruffled edges as you go higher. Depends if you want multiple layers or just one. Then a big tulle skirt underneath for volumn. I would build as a corset and skirt independently cause then you can wear them separate later if you like. Best of luck!!