Wix is simple to use but there are a lot of parts to learn. And not everything works as you would have it.
Once you think you have your favorite template copy it and experiment with structure, ideas, forms, etc... Don't fill in all of your content, just make sure you are able to get things looking and feeling the way you want them.
Think of this like a test drive. This will free you up to move quickly and test concepts without all the pesky time needed to make everything perfect.
We find that 2 separate 4hour blocks is plenty of time.