I have a question regarding the tsugai and getting them

So i remember the living transfer thing that Oshi something goddess said that she has been with the same family for generations. So the family has been having her as an heirloom of sorts lol

my main questions are::

I forgot the details of how having a tsugai is, but aside from the Living transfer, where they just talk it out, people die right and they can just take their Tsugai from the master? Or just leave the tsugai to be a stray?

So they just spill their blood on the Newly-stray Tsugai to be that tsugai's master?

so to have a tsugai, one can arrange for a living transfer (no bloody wars and battles) or killing the master straight off?

Like those are the only things to do so far?