You need an empowerment, oral transmission of the sadhana and explanations how to do the sadhana. You need to accept someone as a Guru to get a empowerment, if not you are just a tourist in the vajra mountains.
I figured as much. I don't disagree , but this begs the question...how did the first practitioners of this tradition accomplish anything since they would have to have been without a guru? The chain must have begun somewhere. Outside of Vajrayana, how did Buddha become enlightened without a guru? I am not equating myself with these sages and their ability to accomplish on their own, I am just curious.
If one accepts someone as their guru, can they change gurus? What if the guru and or his student move away?