Ooh, France. Fancy. Welcome to coscom, Sarah.
Cosplay isn't so difficult as people believe. Yes, there are times when you have no idea how to approach a problem, or after staring down your wig for hours you feel like throwing it to the abyss, but it's all worth it in the end when everything falls into place. If you've got experience with Lolita, chances are you won't have nearly so many holdups as the average first-timer.
Good luck, and don't hesitate to ask around for advice. I'm sure the EGL forum here will be especially glad to have you.