The 12 Half Truths of a Lean Transformation [the broken link was removed] by Charles Hagood. A one page article reinforcing what adopting lean methods will require.
The process of improving never ends. A Lean transformation has no end date! The process is ongoing and is never a closed out action item. There is no such thing as the perfect company or process, therefore the closest to perfect you can become is to recognize that it is a continuous process of improvement.