I made one a while back but realized it wasn't very well thought through.
This one is more condensed yet more thorough and points out the two things that can go wrong and how to avoid them.
I hope someone finds it useful.
[ame="https://www.youtube.com/watch?v=7V3cQJ25uro"]https://www.youtube.com/watch?v=7V3cQJ25uro[/ame]