Analysis and Understanding
What is the status of your organisation? Where do we start from? Which levers do we use to start with? How do we know what effect the change will have?
These questions define the first exercises. Take small steps, check assumptions and go ahead. That's agile.
Think and Design
You have an understanding of the status of your organisation, you can now begin to think about and design the first moves.
It is a complex system no one can claim to know all parameters. So don't plan too much into the future. Take small steps, but take them.
Define the results and vision you want fulfilled. Define your first moves and topics. Now you can test your ideas.
Start the Journey
You now know what to do, you have a hypothesis.
Implement in short cycles testing your assumptions and go on from there.
Take small steps, learn, adapt and do not lose sight of your leadership vision.
Things can't go wrong, though they can return unexpected results to learn from.