I would just wait until you get back. You never know if a piercing will effect you badly, and if it does, you won't even be in the same country as your piercer. Another reason I would recommend waiting is because a piercing is a wound, even if you don't want to think about it like that. Traveling puts a lot of stress on people, and your piercing will already be stress on your body.
I know several people with septums done, they said it was annoying to sneeze and moving their noses around for a few weeks was painful. Piercers should pierce in the sweet spot, but that doesn't mean it won't hurt. You will most likely feel like you were punched in the face for few days.
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