You will not. But you should also be able to borrow it before you have need of it-- their gift will simply replace yours, albeit in a reduced state, and you may use it at a later time.
Only theoretically. Attempt to use it in this fashion, and the very first person you use it upon who does have a gift will quickly stop you in your tracks. Personally, I would not recommend it.
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That is good to know. If I try to borrow a boon that has been used, how will I know? It simply won't work?
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. . . I'll let you know when I've decided on a course of action.