This is the first of a few YouTube videos I want to make showing how to put electronics into your craft project. I made it from a crafters point of view because so many tutorials on this subject are written by someone from an electronic background.
This is how to put one LED into your craft project.
3 volt battery
Sewable battery holder
And obviously the project you want to use.
I hope the video shows you clearly enough, but am always happy to help.