Is there any procedure to be followed when an half-elf gives up immortality?

Question

I went through the following questions, Why can Arwen decide her mortality?. It explains who can give up immortality. I would like to know if Tolkien had ever mentioned a procedure/ritual that has to be performed to give up immortality or it's just a decision in mind to give it up?

Secondly can this decision be reversed?

@Richard of course, no hero ever achieves anything until they've turned in their badge and gun... — AakashM, Apr 15 '15 at 11:51

score 5 · Accepted Answer · answered Apr 15 '15 at 04:57

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There's no mention of any kind of magic procedure, spell, incantation, etc. needed. Half-Elves are simply born with the option to make a one-time-only choice between immortality or mortal life with an unknown afterlife.

answered Apr 15 '15 at 04:57

Joe L.

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It's worth adding that this only applies to Earendil, Elwing and their descendents. Other Half-Elves, such as the children of Imrazor and Mithrellas, don't get to choose: they're Men. – Apr 15 '15 at 09:11
That is the sole reason I added the other question http://scifi.stackexchange.com/questions/31345/why-can-arwen-decide-her-mortality – Vishvesh Apr 15 '15 at 11:53

Is there any procedure to be followed when an half-elf gives up immortality?

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