How do I get myself going on using leaders and enders?

Leaders and Enders are when you start a seam/finish a seam onto a different piece of material so you don't waste as much thread.

How do you set up your odds and ends or pieces so you always use leaders and enders? And, do you sew all the way through the item or only partly through the item when you do it?

I get one or two set up but quickly run out of pieces. I finally decided I could have my strips or squares or other precut pieces just sitting nearby, but haven't gotten into the habit of doing it.

How did you get the habit?