The five steps you have to carry out to implement LEAN in your enterprise are:

1. Specify value from the standpoint of the end customer by product family.
2. Identify all the steps in the value stream for each product family, eliminating whenever possible those steps that do not create value.
3. Make the value-creating steps occur in tight sequence so the product will flow smoothly toward the customer.
4. As flow is introduced, let customers pull value from the next upstream activity.
5. As value is specified, value streams are identified, wasted steps are removed, and flow and pull are introduced, begin the process again and continue it until a state of perfection is reached in which perfect value is created with no waste.

And now I link you a youtube interview with James P. Womack, the author of The Machine That Changed the World and Lean Thinking.

5 Good Questions with Jim Womack

Another interesting interview with Womack:

Take the Value-Stream Walk: Presentation by Jim Womack