AS somone said a lot of the Jedi Mythos is based on Eastern phylosohy and such.
Its a mixtuer of things. If you think about it. It seem more likely that it has to do with
1. Being prepared for death
2. Giving yourself over to a transformation
Rather than actual death.
I think those strong in the force can almost cheat death by allowing there physical body to be left behind or destroyed while there life force lives on in the same existance as the rest of us. Unlike normal peopl who die.
Physics 101. Energy can not be destroyed. It only changes form. I thikn there is an act of will involved. Yoda likely knows about it already but its not something you can teach unless you have done it already. Its kind of a zen/chan thing. The dao cannot be described, when you describe the dao it is no longer what you described.
I also think that speaking to people like yoda, from the other side of death(QGJ) is not the same. Unless Quaigon actually appears before someone.
Anyway. I think I have it right. Its about being prepared for death then letting go of this physical form of life.