Can you iterate?
Iterating is not the same as having no idea what you are doing. It is in fact quite the opposite. You know where you want to be, but don’t know the way to get there.
Because where you want to be is in the future, you will know more about how to get there the closer you are to it. As you pave that road, you will discover the sink holes, the hills, and the wide open spaces that you could not see from afar.
So start paving. It doesn’t matter if you need to go back later and put up some cones.