@Heijneker If there is one thing which is a good predictor of success in improving efficiency it is willingness to change. The various techniques such as 5S, 7 Wastes or SPC charts can all be learned but without the desire to change, they are generally worthless. You have the desire so you will do amazing things in your business.
One word of warning, the Lean world constantly talks about waste (things which do not add value), once you start to see them, they are everywhere, in every product or service you buy and you cannot un-see them.
Here is a quick video from Paul Akers at Fastcap showing how a simple process can be significantly improved. As an aside, Paul Akers publishes a huge range of stuff on non technical Lean, including free audiobooks.