Bava Batra 131: Appointing an Administrator for One's Estate

What happens when a healthy person wants to allocate his property as gifts? In contrast to the cases we've seen to this point, which have been deathbed utterances. Also, what happens when there's an administrator (apotropa) appointed over the estate. Note that the case doesn't spell out the relationship between all parties. Plus, how does the appointment of an administrator function in the context of gift-giving vs. the default inheritance?