Make the plan you can – don’t worry about the one you can’t.
So many project managers tell me that they’ve not made a plan because something is missing… but they’re just hurting themselves! Instead of making some progress, they put it to the back of their minds… right up until it’s needed. Then it’s too late!
If you can’t make a detailed plan, don’t worry about it.
If you have too much ambiguity, don’t worry about it.
If you don’t have the skills, don’t worry about it.
Just do what you can right now, because starting is better than not starting, and having something is better than nothing!
We can figure out the rest later.