1. Whether to change your boarding pass again depends on whether the staff will provide you with the final boarding pass when you apply for it in Shanghai-Zurich. If it is the final boarding pass, Zurich-Dü sseldorf does not need to be changed. If it's just a simple boarding pass from Shanghai to Zurich, you need to renew it. Because some international companies finally provide one-vote service, while others don't. Be sure to ask the staff when you get the first boarding pass!

You don't need to confirm your seat online in advance. You can confirm it in advance if you like. There is no limit to this. If you don't have time to surf the internet, you can go to the counter to get your boarding pass that day. Just tell the staff who changed their boarding passes what kind of seats you need.

As it is your first time to go abroad, I would like to remind you that there is usually a small counter near the international departure port, where you can get your boarding pass. There is an international exit application form on it. You need to fill it out, and then you can get your boarding pass and application form, passport and visa.