It can be implemented in many ways depending on the organizational setup and transitioning environment. Here is a possible method for now.
You go to work, wherever you are working now, just the way you are doing now. Work for 40 hours (in USA). At the end of the week your boss will enter 40 hours in your plastic card, very similar to present day credit card.
You will use that plastic card to buy things from grocery store or from any other place. You will swipe the card at the checkout counter just the way you do now. The number 40 will not reduce as you buy things.
Nothing has to change. In fact in this kind of transition method people will not even know, or need to know, that we have switched to a MLE based society. All you will notice is that there will be plenty of jobs for everybody. Nobody will remain unemployed.