Do I/we have to design the ceremony all by myself/ourselves?

Only if you want to. I’m happy to give ideas and suggestions. What I’ve found though, is that once people are asked the right questions, people get clearer about the type of ceremony they want and what elements they’d like included.

Generally, after meeting, I’ll write out the ceremony structure, including the things you’ve agreed upon and email it to you, so you can give feedback about any additions or changes you’d like.