The following three video tutorials are for die-hard DIYers. Not sure if any of them are suitable for selfbondage sessions, though ;-)

Anyway, enjoy:

Part I

https://www.youtube.com/watch?v=dUdbDaa46mk

Part II

https://www.youtube.com/watch?v=DyNzqmJQkp4

Part III

https://www.youtube.com/watch?v=1qmvM6sbke8